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.
More Nation & World Headlines
Debris linked to missing Malaysian 777 777 departs Aleutians after emergency landing Export-Import Bank excluded from highway bill House approves highway funding bill Taliban leader Mullah Omar dead, Afghans say Administration wants to give prisoners access to Pell grants GOP leaders plan Senate vote on Planned Parenthood fed aid 8 children hurt, 2 critical, by falling tree in California
Our new comment system is not supported in IE 7. Please upgrade your browser here.