5th Battalion 11th Marines (5/11) is a High Mobility Artillery Rocket System (HIMARS) battalion consisting of four Firing Batteries and a Headquarters Battery. The battalion is stationed at Marine Corps Base Camp Pendleton, California. It is the first active duty HIMARS Unit in the Marine Corps. They fall under the command of the 11th Marine Regiment and the 1st Marine Division. This is the only battalion in the 11th Marine Regiment not using the M777A2 lightweight howitzer. Mission Provide direct support of the 1st Marine Division and the Marine Expeditionary Units in time of conflict. That support may come in the traditional fashion of artillery support to maneuver forces, or by providing batteries to serve as provisional rifle companies. They also have the secondary mission of being the primary providers of civil-military operations (CMO). CMO is defined as the activities of the commander that establish, maintain, influence, or exploit relations between military organizations, Government and civilian organizations and the civilian populace. Current units Headquarters Battery – "HQ" Battery Battery Q – "Quebec," Battery Battery R – "Romeo," Battery Battery S – "Sierra," Battery Battery T – "Tango," Battery History World War II 5th Battalion 11th Marines was activated on 1 May 1942 at New River, North Carolina. In June of that year they deployed to Wellington, New Zealand. They were re-designated on 1 January 1943 as the 4th Battalion, 11th Marines. During the war they participated in the following campaigns: Battle of Guadalcanal Eastern New Guinea New Britain Battle of Peleliu Battle of Okinawa Following the surrender of Japan, the battalion was deployed to Tientsin, China as part of the occupation of northern China from October 1946 to January 1947. In January they returned to the United States to Marine Corps Base Camp Pendleton, California and were reassigned to the 3rd Marine Brigade. The battalion was deactivated on 17 February 1947. Later that year they were again activated on 16 July only to be deactivated again on 30 September. Korean War The battalion was reactivated on 4 August 1950 at MCB Camp Pendleton and were assigned to the 1st Marine Division. In August they deployed to Kobe, Japan and fought in the war until the Korean Armistice Agreement was signed on 27 July 1953. They participated in the following campaigns: Inchon/Seoul Campaign Battle of Chosin Reservoir East/Central Front Western Front Following the war the battalion remained in Korea and participated