The 11th Marine Regiment consists of a headquarters battery and four artillery battalions. The regiment is the primary source of fire support for 1st Marine Division. It provides direct and indirect fire support to frontline units as required by the infantry commanders. The regiment's organic weapons are the 155 mm M777 lightweight howitzer, the High Mobility Artillery Rocket System (HIMARS) and the 120 mm Expeditionary Fire Support System. The regiment is headquartered at Camp Las Pulgas. Camp Las Flores houses 5th Battalion, while 3rd Battalion resides at Marine Corps Air Ground Combat Center Twentynine Palms, Calif.