U.S. Marine Corps 1ST Force Service Support Group Marines provide security from inside the cargo area of a Medium Tactical Vehicle Replacement (MTVR) 7-ton truck during the simulated live-fire application process of the Convoy Security Course at Camp Deluz, located onboard Marine Corps Base Camp Pendleton, Calif., on Aug. 14, 2004, to learn how to respond immediately to enemy fire. (U.S. Marine Corps photo by Lance CPL. Samantha L. Jones) (Released)