Combat logistics battalions (CLB) provide combat service support for the GCE and ACE beyond their organic capabilities. The battalions primarily provide motor transport and logistics control and materiel handling (i.e., landing support) services, and limited engineer, maintenance, and supply services, to dedicated Regimental Combat Teams (RCT) or Marine Expeditionary Units (MEU). CLBs that support RCTs typically consist of a headquarters and service company, and three support companies (engineer, maintenance, and transportation); those CLBs that support MEUs typically consist of several functional units (individual units may be styled as either a section, platoon, detachment, or company depending upon the size of unit, function, and the unit's parent battalion/regiment/group). In addition to a headquarters and service unit, these CLBs contain units dedicated to providing: air delivery, communications, engineer, explosive ordnance disposal, health services (medical and dental), landing support, law enforcement (military police), maintenance, motor transport, and supply support to the MEU.