Crew’s .the FBI was told that intelligence was using “all of its scientists” to determine whether or not “such a phenomenon could, in fact, occur.” Furthermore, then research was “begin conduced with the thought that the flying object might be a celestial phenomena,” or that “they might be a foreign body mechanically devise and controlled.” Three weeks later they conduced that “this ‘flying saucer’ situation is not all imaginary or seeing too much in some natural phenomenon. Something is really flying around.” A further review by the intelligence and technical divisions of the Air Materiel Command at Wright Field reached the same conclusion, that “ the phenomena is something real and not visionary or fictitious,” that there were object in the shape of a disc, metallic in appearance, and as big as man-made aircraft. They were characterized by “extreme rates of climb maneuverability, “ general lack of noise, absence of trail, occasional formatting flying, and “evasive” behavior “when sighted or contacted by friendly aircraft and radar,” suggesting either manual, automatic, or remote control. It was thus recommended in late September 1947 that an official Air Force investigation be set up to investigate the phenomenon. This led to creation of the 1948, and then Project Blue Book in 1952. Blue Book closed down in 1970, ending official Air force UFO investigations.
Use of “UFO” instead of “flying saucer” was first suggested in 1952 by Capt. Edward J.Ruppelt, the first director of Project Blue Book, who felt that “flying saucer” did not reflect the diversity of the sightings. Ruppelt suggested that “UFO” should be pronounced as a word-“you –foe”. However it is generally pronounced by forming each letter:”U.F.O.” his term was quickly adopted Air Force which also briefly used “UFOB” circa 1954. Ruppelt recounted his experiences with Project Blue Book in his memoir, the report on Unidentified Flying Objects, also the first book to use the term.
Air Force Regulation 200-2, issued in1954, defined Unidentified Flying Objects (UFOB) as “any airborne object which by performance, aerodynamic characteristics, or unusual features, does not conform to any presently known aircraft missile type, or which cannot be positively identified as a familiar object.” The regulation also said UFOBs were to be investigated as a “possible threat to the security of the United states” and “to determine technical aspects involved.” Furthermore, Air force personnel were directed not to discuss unexplained cases with the press.