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Marines with 1st Combat Engineer Battalion, 1st Marine Division, I Marine Expeditionary Force, fire antipersonnel obstacle breaching systems during Exercise Pioneer Express at Camp Roberts, Calif., Sept. 8, 2015. The exercise prepares Marines to successfully execute expeditionary operations by refining command and control methods, reconnaissance, mobility, counter-mobility and survivability operations. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel) - Marines with 1st Combat Engineer Battalion, 1st Marine Division, I Marine Expeditionary Force, fire antipersonnel obstacle breaching systems during Exercise Pioneer Express at Camp Roberts, Calif., Sept. 8, 2015. The exercise prepares Marines to successfully execute expeditionary operations by refining command and control methods, reconnaissance, mobility, counter-mobility and survivability operations. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel)

Marines with 1st Combat Engineer Battalion, 1st Marine Division, I Marine Expeditionary Force, deploy an assault vehicle launched bridge during Exercise Pioneer Express aboard Camp Roberts, Calif., Sept. 1, 2015. The exercise will ensure that the Marines and Sailors of the battalion will remain effective through complex training evolutions and detailed evaluations. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel) - Marines with 1st Combat Engineer Battalion, 1st Marine Division, I Marine Expeditionary Force, deploy an assault vehicle launched bridge during Exercise Pioneer Express aboard Camp Roberts, Calif., Sept. 1, 2015. The exercise will ensure that the Marines and Sailors of the battalion will remain effective through complex training evolutions and detailed evaluations. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel)