MEU CLB 31 (USMC) The MEU CLB 31 (USMC), or Marine Expeditionary Unit Command and Control Element, is a tactical-level headquarters within the United States Marine Corps. This element forms part of a Marine Expeditionary Unit (MEU), which is a self-contained, quick-reaction force capable of conducting a wide range of military operations, including amphibious assaults, humanitarian assistance, and disaster response missions. The MEU CLB 31 provides command and control functions to the unit during its deployment, ensuring effective coordination and execution of the assigned mission. The USMC routinely deploys multiple Marine Expeditionary Units worldwide to maintain a ready global force.