Project Blue Book was one of a series of systematic studies of unidentified flying objects (UFOs) conducted by the United States Air Force. It started in 1952, the third study of its kind (the first two were projects Sign (1947) and Grudge (1949). A termination order was given for the study in December 1969, and all activity under its auspices officially ceased in January 1970.
Inside The Real Project Blue Book - The Disclosure Project Revealed (Video)
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