D-21
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Why America Spied on Cold War China With a Mach 3 D-21 Drone
The Mach 3 D-21 Drone Was a Secret America Cold War Spy Machine
The Top Secret History of the D-21 Mach 3 Spy Drone Revealed
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
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