A program dedicated to the investigation…

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Wednesday, December 17, 1969: A program dedicated to the investigation of UFOs (called Project Blue Book) was terminated. For more than 20 years, the U.S. Air Force had examined 12,618 sightings. Most of these were found to be caused by man-made objects such as balloons, satellites, and aircraft; natural or astronomical phenomena; weather; and hoaxes. At the time of the program’s termination, 701 UFOs remained unexplained