A U.S. Marine M777 howitzer with 1st Battalion, 4th Marines, Camp Pendleton, Calif., fires while participating in a Brigade Assault Course training event Feb. 9, 2015, during Integrated Training Exercise 2-15 at Twentynine Palms Marine Corps Air Ground Combat Center (MCAGCC), Calif. 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 Master Sgt. Donald R. Allen/Released)