U.S. Marines assigned to Alpha Battery, 1st Battalion, 12th Marine Regiment, 3rd Marine Division, III Marine Expeditionary Force attached to 3rd Marine Regiment Force stationed out of Marine Corps Base Hawaii, fire a M777A2 lightweight 155 mm howitzer for a mission in support of Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., Feb. 10, 2015. MCAGCC conducts relevant live-fire combined arms training, urban operations and joint/coalition level integration training that promotes operational forces readiness. (U.S. Air Force photo by Staff Sgt. Amy F. Picard/Released)