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(From left to right) Letter of UFO sighting dated November 4, 1966 from the James E. McDonald papers, Special Collections, University of Arizona: “Enclosed I am sending the description of an object that I have observed in 1957 in Indiana, and the picture that was made in 1959 in Illinois (page 2 and 3). If you wish any additional information, please advise. Also I appreciate if you write me a short comment about the enclosed Theory of Transformation.” | A depiction of the UFO sighting known as the "Washington Flap" in July 1952 | An encounter between a Navy F/A-18 Super Hornet and an unknown object released by the Defense Department's Advanced Aerospace Threat Identification Program in 2017