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This FBI file serial 164 in 62-HQ-83894 holds several copies of Air Intelligence Requirements Memorandum Number 4, "Unconventional Aircraft," issued 15 February 1949 by the Directorate of Intelligence, Headquarters United States Air Force. Major General C. P. Cabell signed it. It sets out continuing Air Force requirements for information on unconventional aircraft and unidentified flying objects, including "Flying Discs," and tells commands and outside agencies to send reports to the Air Materiel Command at Wright-Patterson AFB. It also lists detailed reporting questions on sightings, observers, radar data and physical evidence.
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. P lace 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 obj ects. c . Size at distance. 7. Reliability of observer. a . Sources. RESTRICTED - 5 -
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