The Boeing X-37B (also termed the Orbital Test Vehicle), operated by the US Air Force. X-37B is a technology demonstrator for spacecraft reusability, as well as a platform for recoverable medium-duration scientific and engineering experiments in the space environment, such as component testing and materials-exposure testing. Two orbiters were built, and have performed six total flights, launching on both ULA's Atlas V and SpaceX's Falcon 9

Payload bay doors are openable, and the distinctive folding solar array is included as well

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