U.S. Marine Corps Pfc. Josh Barnett, a machine gunner

U.S. Marine Corps Pfc. Josh Barnett, a machine gunner with Bravo Company, 1st Battalion, 4th Marine Regiment, 13th Marine Expeditionary Unit, provides security on an amphibious assault vehicle 7 during Exercise Iron Fist 2013, aboard Marine Corps Base Camp Pendleton, Calif., Feb. 13, 2013. During Exercise Iron Fist 2013, the 13th MEU and Japan Ground Self-Defense Force spent three weeks participating in bilateral training which improved their interoperability, enhanced military-to-military relations, and sharpened skills essential to crisis response. (U.S. Marine Corps photo by Lance Cpl. David Gonzalez/released)