Combat Logistics Battalion 31 (CLB-31) is a logistics battalion of the United States Marine Corps. CLB-31 is the Logistics Combat Element (LCE) of the 31st Marine Expeditionary Unit (31st MEU), the only continuously forward-deployed MEU in the Marine Corps. Although CLB-31 is assigned to the 3rd Marine Logistics Group, the battalion remains permanently assigned to the 31st MEU. CLB-31 is based on Camp Hansen in Okinawa, Japan.