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The Lockheed D-21, a Mach 3.3 Drone intended for launch from the SR-71 Blackbird : r/EngineeringPorn
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Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned
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The story of the D-21 Drone and project Senior Bowl, the Most Secret Program ever developed by the famed Lockheed Skunk Works - The Aviation Geek Club
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