The 31st Marine Expeditionary Unit (31st MEU) is one of seven Marine Expeditionary Units currently in existence in the United States Marine Corps. The Marine Expeditionary Unit is a Marine Air Ground Task Force with a strength of about 2,200 personnel. The MEU consists of a command element, an infantry battalion with artillery, amphibious vehicle and other attachments, a composite helicopter squadron reinforced with a Harrier squadron and a combat logistics battalion. The 31st MEU is currently based out of Camp Hansen, Marine Corps Base Camp Smedley D. Butler, Okinawa, Japan. This is the only permanently forward-deployed MEU, and is America's expeditionary force-in-readiness in the Asia-Pacific region.