The U.S. Air Force says it will launch an unmanned X-37B spaceplane for a fourth mission no earlier than May 20.Built by Boeing Space & Intelligence Systems of El Segundo, California, the X-37Bs are reusable unmanned orbital maneuvering vehicles that launch atop an expendable rocket and return to Earth much like NASA’s now-retired space shuttle and glides in for a runway landing.
The Air Force declined to say which of the two X-37B spaceplanes the service will use for the mission.
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