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This image provided by the U.S. Air Force shows the X-37B during encapsulation within the United Launch Alliance Atlas V 5-meter fairing Feb. 8, 2011 in Titusville, Fla. The fairing protects and carries the Orbital Test Vehicle into space. The Air Force has launched a second experimental space plane that resembles a small shuttle. An Atlas 5 rocket blasted off with the unmanned space plane Saturday afternoon March 5, 2011 from Cape Canaveral Florida. (AP Photo/US Air Force)

This image provided by the U.S. Air Force shows the X-37B during encapsulation within the United Launch Alliance Atlas V 5-meter fairing Feb. 8, 2011 in Titusville, Fla. The fairing protects and carries the Orbital Test Vehicle into space. The Air Force has launched a second experimental space plane that resembles a small shuttle. An Atlas 5 rocket blasted off with the unmanned space plane Saturday afternoon March 5, 2011 from Cape Canaveral Florida.

Mystery Mini Space Shuttle X-37B Lands in California

June 17, 2012

The Air Force's X-37B, is an unmanned reusable spacecraft built by Boeing that has spent more than a year on a classified mission in space. It landed early Saturday, June 16, morning at Vandenberg Air Force Base in California after weather conditions kept pushing back landing attempts the last few days.