1947-06-24 / Muroc Air Field, Muroc, California / unresolved
The Air Materiel Command issued this initial report on unidentified flying objects on 23 April 1948, prepared at Wright-Patterson Air Force Base under Project SIGN, which had been directed by a Headquarters USAF letter dated 30 December 1947 signed by General L. C. Craigie on the subject of "Flying Discs." The report tabulates 100 sightings from 1947 through 1 February 1948, noting that exhaust trails were reported 23 times and that speeds ranged from hovering to supersonic.
Unidentified flying objects (UFOs), also referred to as 'flying discs' and 'flying saucers'