From 19fortyfive.com:
The X-37B Orbital Test Vehicle, or OTV, is an experimental test space vehicle that is planned as a reliable, reusable, unmanned space test platform for the U.S. Space Force. Since its first flight in 2010, the X-37B has served NASA, the US Air Force, and now the US Space Force. It is one of the most intriguing aircraft in the US inventory. Although most analysts believe it is a space spy vehicle, no one really knows what its mission is.
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