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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.
“ROTOR”17 pages
.• '' 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 intell1gence 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
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