Awaiting editorial reviewSerial 164
FBI Case 62-HQ-83894, Serial 164: Air Force Air Intelligence Requirements Memorandum No. 4, Unconventional Aircraft
Prepared summary.
On February 15, 1949, the U.S. Air Force Directorate of Intelligence in Washington, D.C. issued Air Intelligence Requirements Memorandum Number 4, titled "Unconventional Aircraft." The memorandum established reporting procedures for sightings of unconventional aircraft, unidentified flying objects, and "Flying Discs," directing reports to Air Materiel Command at Wright-Patterson Air Force Base, Dayton, Ohio, attention MCIAXO-3, with copies to the Director of Intelligence.
Source text
Document text
[page 1] FBI - CENTRAL RECORDS CENTER HQ - HEADQUARTERS Class / Case # 0062 83894 Sub 1 Vol. 164 Serial # ONLY DO NOT DESTROY DO NOT DESTROY FOIPA # 1142292 Declassification authority derived from FBI Automatic Declassification Guide, issued May 24, 2007. 62-83894-164 ENCL BEHIND FILE [page 2] . RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 3] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. पु (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies [page 4] RESTRICTED b. Air meno fotogeny smogus neque. 10 Apk butt avstrupe fatal tooteid (1) Type aircraft, speed, altitude, direction of flight. bsmos (8) A (2) Distance and direction from city, town or known landmark. to ve! (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. [page 5] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. [page 6] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 7] RESTRICTED edit (1) Neighbors. (2) Police Dept. 189 (3) FBI records. (4) Employer. bood fed 8. Notes relative to observer on: repleb a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light.. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? C. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED [page 8] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. C. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 9] RESTRICTED RESTRICTED [page 10] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 11] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. C. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies [page 12] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | | b. Airb | boste ooges sillzw (3) | |-|-|-| | | (1) | Type aircraft, speed, altitude, direction of flight. | | | (2) | Distance and direction from city, town or known landmark.<br />belle roud to wo elevab | | | (3) | Clock position of object from observer's aircraft. | | | (4) | Latitude and longitude. | | | C. Sea | P | | | (1) | Latitude and longitude. | | | (2) | Proximity to land. (Name city, country, etc.) | | 4. Number of objects. | 4. Number of objects. | 4. Number of objects. | | Formation type (if any), sketch if possible. | Formation type (if any), sketch if possible. | Formation type (if any), sketch if possible. | | 5.<br />or | Observable<br />organizations | celestial phenomena or planets that may account for the sighting. (Local facilities<br />which follow such celestial phenomena should be consulted for such information.) | | 6. | Distance | of object from observer. | | | a. | Laterally or horizontally. | | | b. Angle | of elevation from horizon. | | | C. | Altitude. | | 7. | Time in | sight. | | 8. | Appearance | of object. | | | a. Color. | | | | b. Shape. | (Sketch if possible) | | | c. | Apparent construction. (Of what material or substance) | | | d. Size. | | | | (1) | Estimated size. | | | (2) | Size as it appeared from observer's view. (Compared to known object) | | 9. | Direction | of flight. | | 10. | Tactics | or maneuvers. | | | Vertical | ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. | Evidence | of exhaust. | | | a. Color | of smoke. | | | b. Length | and width. | [page 13] RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible).. 15. Propulsion. a. Propeller or jet. b. Rotor. C. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. 4. RESTRICTED [page 14] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. C. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 15] RESTRICTED (1) Neighbors. The grailing has elevhe (tabrodes (2) Police Dept. (3) FBI records. (4) Employer. bids Con lakto 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. - 6- RESTRICTED [page 16] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 17] RESTRICTED RESTRICTED [page 18] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 19] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. star (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies [page 20] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | | b. Air | of ad gw bezonego notthew gregmoiggid (8)<br />A Betel ballads souellofal to 2010 | |-|-|-| | | (1) | Type aircraft, speed, altitude, direction of flight. Janine gute (8) | | | (2) | Distance and direction from city, town or known Total landmark. ) sharanate? to ch A | | | (3) | Clock position of object from observer's aircraft. | | | (4) | Latitude and longitude. | | | c. Sea | | | | (1) | Latitude and longitude. | | | (2) | Proximity to land. (Name city, country, etc.) | | 4. | Number | of objects. | | | Formation | type (if any), sketch if possible. | | 5.<br />or | Observable<br />organizations | celestial phenomena or planets that may account for the sighting. (Local facilities<br />which follow such celestial phenomena should be consulted for such information.) | | 6. | Distance | of object from observer. | | | a. | Laterally or horizontally. | | | b. Angle | of elevation from horizon. | | | C. | Altitude. | | 7. Time in sight. | 7. Time in sight. | 7. Time in sight. | | 8. | Appearance | of object. | | | a. Color. | | | | b. Shape. | (Sketch if possible) | | | C. | Apparent construction. (Of what material or substance) | | | d. Size. | | | | (1) | Estimated size. | | | (2) | Size as it appeared from observer's view. (Compared to known object). | | 9. | Direction | of flight. | | 10. | Tactics | or maneuvers. | | | Vertical | ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. | Evidence | of exhaust. | | | a. Color | of smoke. | | | b. Length | and width.. | [page 21] RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. C. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED [page 22] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED 5- [page 23] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? 920 C. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## GENERAL (cont.) RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. C. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 25] RESTRICTED RESTRICTED [page 26] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 # AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. b. To establish procedures for reporting such information. [page 27] RESTRICTED R # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. [page 28] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | b. | Air | 3821 to aroge all sme (8)<br />zarubellist to tric | |-|-|-| | | (1) | moto<br />Type aircraft, speed, altitude, direction of flight.<br />(8) | | | (2) | Distance and direction from city, town or known landmark. A<br />to omlevah | | | (3) | Clock position of object from observer's aircraft. | | | (4) | Latitude and longitude. | | C. | Sea | | | | (1) | Latitude and longitude. | | | (2) | Proximity to land. (Name city, country, etc.) | 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. [page 29] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. C. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 30] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 31] RESTRICTED (1) Neighbors. it herois visilleen stevig ed to (abrod (2) Police Dept. (3) FBI records. (4) Employer. ated gob di sale 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED [page 32] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. C. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 33] RESTRICTED RESTRICTED [page 34] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 35] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. C. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) RESTRICTED b. Air ad gesin bexagonaloga natthew grainggg(8) 1A astea balladssonelletal (1) Type aircraft, speed, altitude, direction of flight. A zene gal (5) (2) Distance and direction from city, town or known landmark.vo) shanage A (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. C. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED - 3 - [page 37] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 38] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. SpeedM.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 39] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. [page 41] RESTRICTED RESTRICTED [page 42] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. b. To establish procedures for reporting such information. [page 43] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. 12 C. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. [page 44] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | b. Air | 31 bogacones hollow rate (qua (8) | |-|-| | (1) | Type aircraft, speed, altitude, direction of flight.<br />ST | | (2) | Distance and direction from city, town or known landmark. A<br />gelland to wolezab | | (3) | Clock position of object from observer's aircraft.<br />A | | (4) | Latitude and longitude. | | C. Sea | | | (1) | Latitude and longitude. | | (2) | Proximity to land. (Name city, country, etc.) | | 4. Number | of objects. | | Formation | type (if any), sketch if possible. | | 5. Observable<br />or organizations | celestial phenomena or planets that may account for the sighting. (Local facilities<br />which follow such celestial phenomena should be consulted for such information.) | | 6. Distance | of object from observer. | | a. Laterally or horizontally. | a. Laterally or horizontally. | | b. Angle | of elevation from horizon. | | c. | Altitude. | | 7. Time in | sight. | | 8. Appearance | of object. | | a. Color. | | | b. Shape. | (Sketch if possible) | | C. | Apparent construction. (Of what material or substance) | | d. Size. | | | (1) | Estimated size. | | (2) | Size as it appeared from observer's view. (Compared to known object) | | 9. Direction | of flight. | | 10. Tactics | or maneuvers. | | Vertical | ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. Evidence | of exhaust. | | a. Color | of smoke. | | b. Length | and width. | [page 45] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. RESTRICTED [page 46] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 47] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. ado) To b 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. # UNCONVENTIONAL AIRCRAFT (cont.) ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? C. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. 6- RESTRICTED [page 48] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. .8 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 49] RESTRICTED RESTRICTED [page 50] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 51] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com- mand. ## PART II REQUIREMENTS ## General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. - 2. RESTRICTED [page 52] RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) C. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED - 3 - [page 53] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED [page 54] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. - 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 55] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. [page 57] RESTRICTED RESTRICTED [page 58] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 59] RESTRICTED R # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. C. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies (1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com- mand. ## PART II REQUIREMENTS [page 60] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | | b. Air | 8.1 jeg for meio (3) | |-|-|-| | | (1) | 0010 to<br />Type aircraft, speed, altitude, direction of flight.<br />(8) | | | (2) | Distance and direction from city, town or known landmark. A<br />gold toolb | | | (3) | Clock position of object from observer's aircraft.<br />Ald | | | (4) | Latitude and longitude. | | | c. Sea | | | | (1) | Latitude and longitude. | | | (2) | Proximity to land. (Name city, country, etc.) | | 4. Number of objects. | 4. Number of objects. | 4. Number of objects. | | | Formation | type (if any), sketch if possible. | | 5.<br />or | Observable<br />organizations | celestial phenomena or planets that may account for the sighting. (Local facilities<br />which follow such celestial phenomena should be consulted for such information.) | | 6. | Distance | of object from observer. | | | a. | Laterally or horizontally. | | | b. Angle | of elevation from horizon. | | | c. | Altitude. | | 7. | Time in | sight. | | 8. Appearance of object. | 8. Appearance of object. | 8. Appearance of object. | | | a. Color. | | | | b. Shape. | (Sketch if possible) | | | C. | Apparent construction. (Of what material or substance) | | | d. Size. | | | | (1) | Estimated size. | | | (2) | Size as it appeared from observer's view. (Compared to known object) | | 9. | Direction | of flight. | | 10. | Tactics | or maneuvers. | | | Vertical | ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. | Evidence | of exhaust. | | | a. Color | of smoke. | | | b. Length | and width. | [page 61] RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 62] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. C. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 63] RESTRICTED (1) Neighbors. amon to stab ed to Cobrod et anol 2 v2) (2) Police Dept. (3) FBI records. (4) Employer. gob the base Pas 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. G ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED [page 64] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. C. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 65] RESTRICTED RESTRICTED [page 66] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. b. To establish procedures for reporting such information. [page 67] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies [page 68] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | | b. | Air ad w m beza ajiliw gengolget to 2010-13 (8)<br />A sted bonusone diletal | |-|-|-| | | | (1) Type aircraft, speed, altitude, direction of flight. 160 (6) | | | | (2) Distance and direction from city, town or known landmark. A | | | | (3) Clock position of object from observer's aircraft. | | | | (4) Latitude and longitude. | | | c. | Sea | | | | (1) Latitude and longitude. | | | | (2) Proximity to land. (Name city, country, etc.) | | 4. Number of objects. | 4. Number of objects. | 4. Number of objects. | | | | Formation type (if any), sketch if possible. | | 5.<br />or | | Observable celestial phenomena or planets that may account for the sighting. (Local facilities<br />organizations which follow such celestial phenomena should be consulted for such information.) | | 6. | | Distance of object from observer. | | | a. | Laterally or horizontally. | | | b. | Angle of elevation from horizon. | | | C. | Altitude. | | 7. | Time | in sight. | | 8. | | Appearance of object. | | | a. | Color. | | | b. | Shape. (Sketch if possible) | | | c. | Apparent construction. (Of what material or substance) | | | d. | Size. | | | | (1) Estimated size. | | | | (2) Size as it appeared from observer's view. (Compared to known object) | | 9. | | Direction of flight. | | 10. | | Tactics or maneuvers. | | | | Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. | | Evidence of exhaust. | | | a. | Color of smoke. | | | b. | Length and width. | [page 69] RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 70] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED .5- [page 71] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. # UNCONVENTIONAL AIRCRAFT (cont.) ## GENERAL (cont.) RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. RM 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. C. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 73] RESTRICTED RESTRICTED [page 74] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 # AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. b. To establish procedures for reporting such information. [page 75] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies (1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com- mand. ## PART II REQUIREMENTS [page 76] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | b. | Air | 3 811 bogatoget new vyamsius (8) | |-|-|-| | | (1) | Type aircraft, speed, altitude, direction of flight.<br />abc (8) | | | (2) | Distance and direction from city, town or known landmark. at moA | | | (3) | Clock position of object from observer's aircraft. | | | (4) | Latitude and longitude. | | c. | Sea | | | | (1) | Latitude and longitude. | | | (2) | Proximity to land. (Name city, country, etc.) | 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. [page 77] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. -4- RESTRICTED [page 78] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 79] RESTRICTED CA (1) Neighbors. role silling a saving D) (2) Police Dept. (3) FBI records. (4) Employer. b 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## GENERAL (cont.) RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 8 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 81] RESTRICTED RESTRICTED [page 82] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 83] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies [page 84] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | | b. Air | Ta 90 Ch 81% o bezoga aliw gigigged (8)<br />A te bold sueletal to 2015 | |-|-|-| | | (1) | Type aircraft, speed, altitude, direction of flight. Aarne gobamo (5) | | | (2) | Distance and direction from city, town or known landmark.) ottotal to job SA | | | (3) | Clock position of object from observer's aircraft. | | | (4) | Latitude and longitude. | | | C. Sea | | | | (1) | Latitude and longitude. | | | (2) | Proximity to land. (Name city, country, etc.) | | 4. Number of objects. | 4. Number of objects. | 4. Number of objects. | | | Formation | type (if any), sketch if possible. | | 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities<br />or organizations which follow such celestial phenomena should be consulted for such information.) | 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities<br />or organizations which follow such celestial phenomena should be consulted for such information.) | 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities<br />or organizations which follow such celestial phenomena should be consulted for such information.) | | 6. | Distance | of object from observer. | | | a. | Laterally or horizontally. | | | b. Angle | of elevation from horizon. | | | C. | Altitude. | | 7. | Time in | sight. | | 8. | Appearance | of object. | | | a. Color. | | | | b. Shape. | (Sketch if possible) | | | c. | Apparent construction. (Of what material or substance) | | | d. Size. | | | | (1) | Estimated size. | | | (2) | Size as it appeared from observer's view. (Compared to known object) | | 9. | Direction | of flight. | | 10. | Tactics | or maneuvers. | | | Vertical | ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. | Evidence | of exhaust. | | | a. Color | of smoke. | | | b. Length | and width. | [page 85] RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 86] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 87] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. na 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. [page 89] RESTRICTED RESTRICTED [page 90] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. b. To establish procedures for reporting such information. [page 91] RESTRICTED A # UNCONVENTIONAL AIRCRAFT (cont.) ## General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. -2- RESTRICTED [page 92] RESTRICTED b. Air 2 bedroge new amerique (3) (1) Type aircraft, speed, altitude, direction of flight. (8) (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. C. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) C. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED - 3- [page 93] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. c. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 94] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. c. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 95] RESTRICTED (1) Neighbors. eros galite badg namos to add Incr (2) Police Dept. (rod leo war hit a tu (3) FBI records. (4) Employer. A 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? C. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED [page 96] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 97] RESTRICTED RESTRICTED [page 98] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 99] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com- mand. ## PART II REQUIREMENTS ## General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. -2- RESTRICTED [page 100] RESTRICTED b. Air ad w Sobregat naliliw gregmoigeud (8) Ash borbu sonesdileful to (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark.) A (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED - 3- [page 101] RESTRICTED c. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 102] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 103] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. C. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. [page 105] RESTRICTED RESTRICTED [page 106] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 # AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs. b. To establish procedures for reporting such information. [page 107] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. C. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (1) Addressees other than those of the United States Air Force are requested to forward reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3. (2) In order to reduce the time factor involved in transmission of this type of information it is requested that, wherever communications facilities permit, subordinate elements be authorized to communicate reports direct to the Commanding General, Air Materiel Com- mand. ## PART II REQUIREMENTS ## General 1. Date of sighting. 2. Time of sighting (zonal by 24 hr. clock). 3. Where sighted (observer's position): a. Ground (1) City, town. (2) Distance and direction from city or town, road, intersection, etc. (3) From building (story), yard, etc. (4) Map coordinates (if feasible) showing latitude and longitude. -2- RESTRICTED [page 108] RESTRICTED b. Air (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark. (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. c. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. c. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) c. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED -3- [page 109] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 110] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. C. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED - 5- [page 111] RESTRICTED (1) Neighbors. there all s eut ta (2) Police Dept. Labrod je cilin ado) (3) FBI records. (4) Employer. b bhail 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? C. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED [page 112] RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. efold 8 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 113] RESTRICTED RESTRICTED [page 114] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 115] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) RESTRICTED b. Air sad kl 81 berou naliliw gammelget (8) sodelled to opCT A 25 bola necpheel (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark.amb A total to (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. C. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) C. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED - 3- [page 117] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 118] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED 5- [page 119] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. [page 121] RESTRICTED RESTRICTED [page 122] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 # AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 123] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 3. REPORTING (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. Jos C. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. [page 124] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) | b. Air | choge illow (8) | |-|-| | (1) | Come A Beauti<br />Type aircraft, speed, altitude, direction of flight.<br />Jest A Jar (8) | | (2) | Distance and direction from city, town or known landmark. and A<br />gellad to h | | (3) | Clock position of object from observer's aircraft. | | (4) | Latitude and longitude. | | c. Sea | | | (1) | Latitude and longitude. | | (2) | Proximity to land. (Name city, country, etc.) | | 4. Number of objects. | 4. Number of objects. | | Formation | type (if any), sketch if possible. | | 5. Observable<br />or organizations | celestial phenomena or planets that may account for the sighting. (Local facilities<br />which follow such celestial phenomena should be consulted for such information.) | | 6. Distance | of object from observer. | | a. Laterally or horizontally. | a. Laterally or horizontally. | | b. Angle | of elevation from horizon. | | C. | Altitude. | | 7. Time in | sight. | | 8. Appearance | of object. | | a. Color. | | | b. Shape. | (Sketch if possible) | | C. | Apparent construction. (Of what material or substance) | | d. Size. | | | (1) | Estimated size. | | (2) | Size as it appeared from observer's view. (Compared to known object) | | 9. Direction | of flight. | | 10. Tactics | or maneuvers. | | Vertical | ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. | | 11. Evidence | of exhaust. | | a. Color | of smoke. | | b. Length | and width. | [page 125] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous c. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. C. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. C. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4- RESTRICTED [page 126] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed - M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. C. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 127] RESTRICTED et 18 (1) Neighbors. the gilles bak stavy (obrod Jers (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. ## Relative to Radar Sightings 1. Re radars operating on ground. a. Observations of range, speed, altitude and size of target. b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn. If radius of turn is not observable, how long did the target stay in the turn and what was its speed? c. Note particularly any separation of distant target into several targets upon approach. Track all if possible. 2. If airborne when object sighted. a. Were there any radar inductions or extra noise on radio circuits? b. Give estimates of size, speed, maneuvers, etc. ## GENERAL 1. Teletype sequences of local weather conditions. 2. Winds aloft report. -6- RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## GENERAL (cont.) RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. .8 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. c. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 129] RESTRICTED RESTRICTED [page 130] RESTRICTED DEPARTMENT OF THE AIR FORCE HEADQUARTERS UNITED STATES AIR FORCE DIRECTORATE OF INTELLIGENCE WASHINGTON 25, D. C. 15 February 1949 AIR INTELLIGENCE REQUIREMENTS MEMORANDUM NUMBER 4 # UNCONVENTIONAL AIRCRAFT PART I GENERAL ## 1. PURPOSE The purpose of this memorandum is twofold: a. To enunciate continuing Air Force requirements for information pertaining to sightings of unconventional aircraft and unidentified flying objects, including the so-called "Flying Discs." b. To establish procedures for reporting such information. [page 131] RESTRICTED # UNCONVENTIONAL AIRCRAFT (cont.) ## 2. RESCISSION (cont.) (2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the Director of Intelligence, Headquarters United States Air Force. steal (3) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (overseas) and organizations under their control in connection with the development of information on this subject. c. Major Air Commands (ZI) (1) Reports will be forwarded direct to the Commanding General, Air Materiel Command, Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv- ing information pertaining to the requirements enunciated in Part II. (2) Copies of such reports may be supplied the Command Headquarters of the installation concerned. (3) A copy of all reports sent to Air Materiel Command in accordance with these instruc- tions will be forwarded at the same time to the Director of Intelligence, Headquarters United States Air Force. (4) Written reports will be submitted on AF Form 112. (5) Commanding General, Air Materiel Command is authorized direct contact with major Air Commands (ZI) and organizations under their control in connection with the develop- ment of information on this subject. d. Non-Air Force Agencies # UNCONVENTIONAL AIRCRAFT (cont.) ## General (cont.) RESTRICTED b. Air ad befogat paliw grogg (8) A 2018 bol upholsonelletal to 7010 (1) Type aircraft, speed, altitude, direction of flight. (2) Distance and direction from city, town or known landmark.) A tal to incub (3) Clock position of object from observer's aircraft. (4) Latitude and longitude. C. Sea (1) Latitude and longitude. (2) Proximity to land. (Name city, country, etc.) 4. Number of objects. Formation type (if any), sketch if possible. 5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities or organizations which follow such celestial phenomena should be consulted for such information.) 6. Distance of object from observer. a. Laterally or horizontally. b. Angle of elevation from horizon. C. Altitude. 7. Time in sight. 8. Appearance of object. a. Color. b. Shape. (Sketch if possible) C. Apparent construction. (Of what material or substance) d. Size. (1) Estimated size. (2) Size as it appeared from observer's view. (Compared to known object) 9. Direction of flight. 10. Tactics or maneuvers. Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc. 11. Evidence of exhaust. a. Color of smoke. b. Length and width. RESTRICTED -3- [page 133] RESTRICTED C. Odor (if any). d. Rate of evaporation. e. Does trail vary with sound? (spurts) 12. Effect on clouds. a. Opened path thru clouds. b. Forced cloud or mists. C. Reflected on cloud. d. Showed thru cloud. 13. Lights. a. Reflected or attached. b. Luminous C. Blinked on and off in relation to speed. 14. Support a. Wings. b. Aerodynamic list of fuselage. c. Vertical jet. d. Rotating cylinder or cone. e. Aerostatic lift (balloon or dirigible). 15. Propulsion. a. Propeller or jet. b. Rotor. c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect). d. Visible exhaust or jet openings. 16. Control and stability. a. Fins b. Stabilizers (horizontal or vertical). (1) Size. (2) Shape. (3) Location. - 4 - RESTRICTED [page 134] RESTRICTED 17. Air ducts. a. Slots. b. Duct openings. 18. Speed M.P.H. 19. Sound. a. Continuous whine or buzz. b. Roar, whistle, whoosh. c. Intermittent. 20. Manner of disappearance. a. Explode. (1) Possibility of fragments. (2) Other physical evidence. b. Faded from view. c. Disappeared behind obstacle. Relative to the Observer 1. Name of observer. 2. Address. 3. Occupation. 4. Place of business. a. Employer or employee. 5. Pertinent hobbies. a. Is observer amateur astronomer, pilot, engineer, etc. b. Length of time engaged in hobby (experience). 6. Ability to determine: a. Color. b. Speed of moving objects. C. Size at distance. 7. Reliability of observer. a. Sources. RESTRICTED -5- [page 135] RESTRICTED (1) Neighbors. (2) Police Dept. (3) FBI records. (4) Employer. 8. Notes relative to observer on: a. Sightings in general. b. How attention was drawn to object(s). (1) Sound. (2) Motion. (3) Glint of light. c. Degree of fatigue and duration of flight at time of sighting in cases where observer is airborne. 9. Witnesses. a. Addressees. b. Occupation. c. Reliability. 10. Comments of interrogator regarding the intelligence and character of person interrogated. # UNCONVENTIONAL AIRCRAFT (cont.) ## GENERAL (cont.) RESTRICTED 3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the time. (Check Canadian activity if close to that border.) 4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force, Army, Weather Units, Research Organizations or any other. 5. If object contacted earth, obtain soil samples within and without depression or spot where object landed (and then presumably departed) for purpose of making comparison of soils. M 6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc. 7. Obtain photographs (or original negatives) where available; if not, secure sketches of: a. Object. b. Surrounding terrain where observed. C. Place where it contacted earth (if this happened). d. Maneuvers. e. Formation if objects were more than two. 8. Secure signed statement. 9. Obtain fragments or physical evidence where possible. 10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum- ably be construed as such). [page 137] RESTRICTED RESTRICTED
Image notes
4 visual notes
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RRP00031XG8 8/11/1274166
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- **Document Identifier:** HQ-83894 - **Serial Information:** 62-HQ-83894-EBF 164 - **Classification:** Declassified under FBI Automatic Declassification Guide, May 24, 2007. - **Marking:** A red plus sign (+) is present, potentially indicating a classification or processing status.
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С.Р. Санее
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63-83894-164