The X-37B Orbital Test Vehicle lands at Vandenberg Air Force Base . (Image credit: U.S. Air Force) The previous mission of the X-37B , which landed at Vandenberg on June 16 , 2012 , lasted 469 days , according to the Air Force . The military has spoken only in generalities about the spacecraft . Theorists speculate it 's a space bomber or a spy plane against China space station .
The X-37B Orbital Test Vehicle lands at Vandenberg Air Force Base . (Image credit: U.S. Air Force) The military has spoken only in generalities about the spacecraft . Theorists speculate it 's a space bomber or a spy plane against China space station .