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This declassified cover image from a 1956 document titled "Project 1794, Final Development Summary Report" shows an artist's concept of U.S. Air Force plans for a flying saucer. Built by Canada's Avro Aircraft, the saucer was supposed to fly at speeds of up to Mach 4. But apparently, it barely got off the ground.
October 6, 2012 8:29 AM PDT
Photo by: National Archives
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