Artillery rounds fired by Marines with 1st Battalion, 10th Marine Regiment make impact at Observation Post 3 during a battalion field exercise held by 2nd Battalion, 8th Marine Regiment at Marine Corps Base Camp Lejeune, North Carolina, March 15, 2016. The battalion coordinated with artillery, mortars and rotary-wing aircraft to direct fire support. - Artillery rounds fired by Marines with 1st Battalion, 10th Marine Regiment make impact at Observation Post 3 during a battalion field exercise held by 2nd Battalion, 8th Marine Regiment at Marine Corps Base Camp Lejeune, North Carolina, March 15, 2016. The battalion coordinated with artillery, mortars and rotary-wing aircraft to direct fire support.