U.S. Air Force Tech. Sgt. John Carmack, 86th Aerial Port Squadron, McChord Field, Wash., tightens the chains on a pallet train during his squadron's monthly training exercise, March 5. Wrapping the chains ensures equipment safety during transit, specifically that the chains do not get stuck in the rails. (U.S. Air Force photo by Staff Sgt. Nicole Celestine/Released)
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