In June 1947, while flying his small plane, pilot Kenneth Arnold reported seeing 9 objects moving at high speeds through the skies over Washington’s Mount Rainier. Widely publicized reports of Arnold’s experience, followed by an increasing number of reported UFO sightings, led the U.S. Air Force to begin an investigation into the sightings, called Operation Sign, in 1948.  The initial investigation resulted in the formation of Project Blue Book in 1952, that project became the longest running of the U.S. government’s official inquiries into UFO sightings, compiling reports on more than 12,000 sightings or related events from 1952 to its dismantling in 1969.

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