Contractors prepare to hoist the X-47B Unmanned Combat Air System (UCAS) demonstrator onto the flight deck of the aircraft carrier USS Harry S. Truman at Naval Station Norfolk, Virginia, in this US Navy handout photo dated Nov 26, 2012. Truman is the first aircraft carrier to host test operations for an unmanned aircraft. The Navy plans to conduct X-47B carrier deck handling tests aboard the ship. Picture taken Nov 26, 2012. [Photo/Agencies]