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Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned
SR-71 Blackbird and Lockheed D-21 Drone - WIP: All The Rest: Motorcycles, Aviation, Military, Sci-Fi, Figures - Model Cars Magazine Forum
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File:Lockheed M-21 mothership & D-21 drone, Seattle Museum Of Flight, Washington (1).jpg - Wikimedia Commons
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