The Air Force is preparing to test an unmanned spacecraft in orbit, with a launch scheduled for December. The X-37B is designed to perform long-duration testing in low-Earth orbit of new technologies. The unmanned vehicle will carry experiments into space, then return with them to Earth. The vehicle... operates autonomously in orbit and for re-entry and landing. This first orbital flight test of the vehicle will be used to determine the capabilities of the craft, said an Air Force spokesman, Lt. Col. Mark Brown. It is part of a former NASA program that was cut as the space agency focused...