Marines with Company C, 1st Combat Engineer Battalion, 1st Marine Division, practice using detonation cord to breach doors during Exercise Pioneer Express aboard Marine Corps Base Camp Pendleton, Calif., Sept. 2, 2015. The exercise ensures that Marines and Sailors remain effective in increasingly complex environments through challenging training and detailed evaluation. ( Marine Corps photo by Staff Sgt. Bobbie Curtis) 1st Combat Engineer Battalion blows through Pioneer Express 150902-M-FK190-004

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Photo credit: © PJF Military Collection / Alamy / Afripics
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Keywords: 1st, armed, ceb, conflict, forces, military, states, united, war