Combat arms instructors review zeroing corrections with McChord Field Airmen individually before they can qualify on the M-4 carbine rifle at Range 108 next to North Fort Lewis, April 9, 2014 at Joint Base Lewis-McChord, Wash. While most of their time is concentrated on the firing range, combat arms instructors inspect and repair weapons, schedule classes, and manage munitions accounts, spare parts and hazardous material issues. (U.S. Air Force photo/ Staff Sgt. Russ Jackson)
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