Chief Master Sgt. Christopher Crafton, 319th Civil Engineer Squadron superintendent, delivers a safety briefing before a FOD (foreign object or debris) walk held May 10, 2013, on the flightline at Grand Forks Air Force Base, N.D. A FOD walk is a safety inspection conducted on flightlines and flight decks to remove foreign objects or debris. (U.S. Air Force photo/Staff Sgt. Luis Loza Gutierrez)
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