A letter of 23 September, 1947, was sent from Lt. Gen. Nathan Twining, Commander of the Air Materiel Command (AMC) at Wright Field (later Wright-Patterson AFB) to Brig. Gen. George Schulgen, Chief, Air Intelligence Requirements Div., USAF.
The letter describes certain characteristics of "flying saucers" as reported by military and qualified civilian witnesses and states that, after confering with several laboratories at Wright Field, it is the opinion of AMC that "the phenomenon reported is something real and not visionary or fictitious."
The letter recommends that Headquarters, Army Air Forces "issue a directive assigning a priority, security classification and Code Name for a detailed study of this matter" by the Army Air Force along with the Navy, the Atomic Energy Commission, the Joint Research and Development Board, the Air Force Scientific Advisory Group, the National Advisory Committee on Aeronautics (predecessor of NASA), the RAND Project (Research Applied to National Needs) and the NEPA Project (Nuclear Energy for the Propulsion of Aircraft).
A document entitled "Intelligence Requirements on Flying Saucer Type Aircraft" issued by General George Schulgen on 30 October, 1947. This was circulated to continental intelligence agencies and to military attaches throughout the world. It requested any and all information on craft that resembled flying saucers and which had unusual characteristics such as "absence of sound when operating under high performance conditions, a plan form approximating that of an oval or disc with a dome shape on the top surface, the ability to disappear by high speed or complete disintegration, the ability to appear without warning as if from extreme altitude (and) the bility to clear a path through clouds." The agents were requested to supply information on craft that had the above characteristics and which were constructed of lightweight, strong material like :composite or sandwich construction utilizing various combinations of metals, metallic foils, plastics and perhaps balsa wood or similar material." (Note: "metallic foil" and "like balsa wood" were terms used by former Air Force officers to describe debris found near Roswell, New Mexico in July, 1947.) The agents were also instructed to provide information on propulsion of special design including nuclear powered craft "which would be characterised by lack of fuel systems and fuel storage space" and craft in which "the power plant would ... be an integral part of the aircraft and could possibly not be distinguished as a separate item."