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D-21 Drone
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America Was Terrified of China's Nuclear Weapons. This Mach 3 Drone Spied on Them.
D-21: This Crazy Looking Mach 3 Drone Tried to Spy on China's Nuclear Bomb Tests
How Russia Got Its Hands on a 'Mini SR-71' Mach 3 Spy Drone (And Stole Its Secrets)
Check Out the D-21: A Mach 3 Drone the U.S. Used to Spy on China's Nuclear Weapons
What a Secret: The U.S. Used Super Fast Mach 3 Drones to Spy on China's Nuclear Weapons
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