III MSB PROVIDES AND COORDINATES DIRECT COMBAT SERVICE SUPPORT (CSS), SECURITY, AND ADMINISTRATIVE SERVICES TO THE III MARINE EXPEDITIONARY FORCE (III MEF) COMMAND ELEMENT (CE) OR 3D MARINE EXPEDITIONARY BRIGADE (3D MEB) HEADQUARTERS (HQ) AND III MEF INFORMATION GROUP (III MIG) HQ IN ORDER TO SUSTAIN COMMAND AND CONTROL OF MAGTF OPERATIONS