Marines with Bravo Company, 1st Combat Engineer Battalion, 1st Marine Division, utilize a Medium Crawler Tractor to build obstacles in support of a combined arms breach exercise at Marine Corps Air Ground Combat Center, Twentynine Palms, Calif., March 11, 2018. Bravo Company and Mobility Assault Company conduct these exercises in order to increase combat effectiveness of the battalion. ( Marine Corps photo by Lance Cpl. Audrey Rampton)

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Keywords: 1st, arms, breach, camp, combined, comstrat, division, marine, palms, pendleton, twentynine