A Marine with 1st Battalion, 2nd Marine Regiment posts security during a military operations on urbanized terrain exercise at Marine Corps Base Camp Lejeune, N.C., Nov. 21, 2017. The Marines conducted MOUT training to maintain combat readiness. (U.S. Marine Corps photo by Lance Cpl. Ashley McLaughlin) - A Marine with 1st Battalion, 2nd Marine Regiment posts security during a military operations on urbanized terrain exercise at Marine Corps Base Camp Lejeune, N.C., Nov. 21, 2017. The Marines conducted MOUT training to maintain combat readiness. (U.S. Marine Corps photo by Lance Cpl. Ashley McLaughlin)

Marines prepare to breach an entrance during a Basic Urban Skills Training course at a Military Operations on Urbanized Terrain event at Camp Lejeune, N.C., April 5, 2017. The Marines participated in the training to learn and reinforce infantry skills as a predeployment work up. The Marines are with 2nd Light Armored Reconnaissance Battalion, Bravo Company, 2nd Marine Division. (U.S. Marine Corps photo by Pfc. Abrey D. Liggins) - Marines prepare to breach an entrance during a Basic Urban Skills Training course at a Military Operations on Urbanized Terrain event at Camp Lejeune, N.C., April 5, 2017. The Marines participated in the training to learn and reinforce infantry skills as a predeployment work up. The Marines are with 2nd Light Armored Reconnaissance Battalion, Bravo Company, 2nd Marine Division. (U.S. Marine Corps photo by Pfc. Abrey D. Liggins)