A Marine with 2nd Battalion, 5th Marine Regiment, 1st Marine Division, sites in a M240B machine gun during an air assault, part of exercise Steel Knight 2018 at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., Dec. 7, 2017. Steel Knight provides effective and intense training in an expeditionary environment to ensure the 1st MARDIV remains combat-ready, interoperable, deployable on a short notice, and lethal when called into action. ( Marine Corps

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