4 / 15
Secret Air Force X-37B Space Plane Mission a 'Spectacular Success'

Mystery Mini Space Shuttle X-37B Lands in California

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.