Los Angeles native, Cpl. Ernesto Argote, a combat engineer with 1st Combat Engineer Battalion, 1st Marine Division, I Marine Expeditionary Force, holds security for his fire team for live fire and maneuver training during Exercise Pioneer Express at Camp Roberts, Calif., Sept. 7, 2015. The exercise provides an opportunity for both individual and collective training for the Marines and the unit and ensures they remain equipped, ready and relevant for future operations. ( Marine Corps photo by Lance Cpl. Caitlin Bevel)

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Keywords: 1st, battalion, ceb, combat, div, division, engineer, expeditionary, express, force, mar., marine, mccre, mef, pioneer, training