Iain Harrison, the first season winner of the History Channel's "Top Shot," signs an autograph for Tech. Sgt. James Callahan, 446th Aircraft Maintenance Squadron, Dec. 3, 2011 at the base exchange at Joint Base Lewis-McChord, Wash. Harrison first set foot on McChord Field as a member of the British Army twenty years earlier and returned to take his Oath of Allegiance to become an American citizen. He also visited with military members and their families. (U.S. Air Force photo by Tech. Sgt. Tanya King/Released)