Tech. Sgt. David Gallegos, 446th Aircraft Maintenace Squadron crew chief, teaches Iain Harrison, the first season winner of the History Channel's "Top Shot," about the heads-up display aboard a C-17 Globemaster III Dec. 3, 2011 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. (U.S. Air Force photo by Tech. Sgt. Tanya King/Released)
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