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Project Blue Book: The United States Air Force closes its study of UFOs.
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Project Blue Book
American systematic study of unidentified flying objects
Project Blue Book was the code name for the systematic study of unidentified flying objects (UFOs) by the United States Air Force from March 1952 to its termination on December 17, 1969. The project, headquartered at Wright-Patterson Air Force Base, Ohio, was initially directed…Source: Wikipedia (CC BY-SA)
Unidentified flying object
Airborne entity that has not been identified or explained
An unidentified flying object (UFO) is an object or phenomenon seen in the sky but not yet identified or explained. The term was coined when United States Air Force (USAF) investigations into flying saucers found too broad a range of shapes reported to consider them all saucers…Source: Wikipedia (CC BY-SA)