Witness fileEnrique Kolbeck, Senior Air Traffic Controller at Mexico City International Airport0Linked incidents1 source-linked records2001-04-30 / Ventura, CA 93001 / unresolvedOn April 30, 2001, Carol Rosin and Jon Cypher sent a letter to a NASA official identified only as "Dan," announcing a Friday meeting and promising to deliver a package at no cost to NASA. A follow-up note, written on Renaissance Hotel stationery, transmitted the French COMETA report "UFOs and Defense: What Should We Prepare For?," originally published in July 1999 by G.S. Presse Communication. Rosin noted in her letter that she had served as spokesperson for Wernher von Braun during the last years of his life and had founded the Institute for Security and Cooperation in Outer Space in 1983.Unidentified flying objects (UFOs), atmospheric phenomena whose origin cannot be attributed to a human source or identified natural mechanism