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ATLANTIC OCEAN (Dec. 9, 2012) The X-47B Unmanned Combat Air System (UCAS) demonstrator taxies on the flight deck of the aircraft carrier USS Harry S. Truman (CVN 75). Harry S. Truman is the first aircraft carrier to host test operations for an unmanned aircraft. Harry S. Truman is underway supporting carrier qualifications. (U.S. Navy photo by Mass Communication Specialist 2nd Class David R. Finley Jr./ Released)