Boeing built at least two X-37Bs for the Air Force in the mid-2000s reportedly at a cost of around a billion dollars apiece. While it looks like a miniature version of NASA’s Space Shuttle, which retired from service in 2011, the X-37B essentially is a small, reusable and maneuverable satellite with a shorter per-mission endurance compared to single-use satellites.....
https://nationalinterest.org/blog/buzz/us-air-forces-secret-x-37b-space-plane-war-machine-69861
https://nationalinterest.org/blog/buzz/us-air-forces-secret-x-37b-space-plane-war-machine-69861
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