An undisclosed number of workers will recover, refurbish and relaunch the 29-foot-long unmanned spacecraft.
The Air Force launched the most recent flight of the unmanned spacecraft from Florida's Space Coast more than a year ago.
It was the second flight for the original X-37B space plane. The craft circled the planet for seven months in 2010. A second X-37B spacecraft spent more than a year in orbit.
The mystery machines are about one-quarter the size of NASA's old space shuttles and can land automatically on a runway.
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