but its design served as the foundation for what eventually became the Air Force's X-37B. Right now, there are two operational X-37B spaceplanes and a single X-37A. The last mission, OTV-6 ...
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Top-secret X-37B space plane ready for daring new orbital maneuverIt's not immediately clear if the service module on OTV-7 is of the same design, or if it's bigger. As we noted in our ...
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