Air Force's X-37B Space Plane Cleared to Launch Tomorrow

Third mission for the space plane, whose cargo remains classified

The secretive U.S. Air Force X-37B robotic space plane has been cleared to lift off Tuesday (Dec. 11).

The X-37B vehicle and its cargo bay packed with a classified payload is set to make the third mission of the program. Also called Orbital Test Vehicle-3, or OTV-3, the unpiloted craft is slated to be hurled into Earth orbit by an Atlas 5 rocket from Florida's Cape Canaveral Air Force Station (CCAFS) at 1:03 p.m. EST (1803 GMT).