
Project Blue Book was one of a series of systematic studies of Unidentified flying objects (UFOs) conducted by the United States Air Force (U.S.A.F.). Started in 1952, it was the second revival of such a study. A termination order was given for the study in December 1969, and all activity under its auspices ceased in January 1970.
Air Force History’s Referencing UFOs in the Blue Book Era
History of the Directorate of Intelligence June 1 – December 31 1952 [13 Pages, 3MB]
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