Marines with Mobility Assault Company, 1st Combat Engineer Battalion, 1st Marine Division, conduct blow-in-place operations during Exercise Pioneer Express aboard Camp Roberts, Calif., Sept. 4, 2014. 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. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel) - Marines with Mobility Assault Company, 1st Combat Engineer Battalion, 1st Marine Division, conduct blow-in-place operations during Exercise Pioneer Express aboard Camp Roberts, Calif., Sept. 4, 2014. 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. (U.S. Marine Corps photo by Lance Cpl. Caitlin Bevel)