U.S. Marines assigned to Alpha Battery, 1st Battalion, 12th Marine Regiment, 3rd Marine Division, from Marine Corps Base Hawaii, prepare a M777A2 lightweight 155 mm howitzer for a fire mission in support of Integrated Training Exercise 2-15 at Marine Corps Air Ground Combat Center Twentynine Palms (MCAGCC), Calif., Feb. 9, 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)