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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)
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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