Marines with 2nd Battalion, 6th Marine Regiment, 2nd Marine Division, II Marine Expeditionary Force practice breaching a doorway during a live-fire, training exercise at MOC-3 range aboard Marine Corps Base Camp Lejeune, N.C., Oct. 21, 2014. The training helped improve the Marines ability to communicate and maneuver through the chaos of urban environments and familiarized them with room-clearing operations.