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The 1960s Supersonic Spy Drone Lost over China!
Recently declassified files of a US intelligence agency reveal that one of the earliest supersonic spy drones was sent on a secret mission over China and never returned. Built by Lockheed Martin with the support of the US Air Force, the drone reportedly was capable of flying at Mach 3.3, reaching an altitude of 95,000 feet, and traversing 3,000 nautical miles on its roundtrip sortie. The D-21 was 43 feet long, weighed 10,300 pounds was...
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