![Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned](https://eurasiantimes.com/wp-content/uploads/2022/03/Sr71_Blackbird-e1655034642232.jpg)
Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned
![Gerry Doyle on Twitter: "did you know: much as the u.s. tried to build a mach 3 reconnaissance drone, the d-21, around the sr-71's mighty j58 engines, the soviet union built the Gerry Doyle on Twitter: "did you know: much as the u.s. tried to build a mach 3 reconnaissance drone, the d-21, around the sr-71's mighty j58 engines, the soviet union built the](https://pbs.twimg.com/media/DpxJepYUcAAjmxK.jpg:large)
Gerry Doyle on Twitter: "did you know: much as the u.s. tried to build a mach 3 reconnaissance drone, the d-21, around the sr-71's mighty j58 engines, the soviet union built the
![Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned](https://eurasiantimes.com/wp-content/uploads/2022/06/Supersonic-Ramjet-Powered-Spy-Drone-D-21.jpg)
Flying Atop SR-71 Blackbird, Meet US' Top Secret Spy Drone That No One Knew Existed Until It Was Abandoned
![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 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](https://theaviationgeekclub.com/wp-content/uploads/2022/01/Senior-Bowl-1280x720.jpg)