The Commanding Officer of MCESG reports to the Commandant of the Marine Corps, exercising command, less operational supervision, of Marines assigned to MSG detachments. MCESG Headquarters is responsible for the screening, training, assignment, administration, logistical support of Marine Corps unique items, and discipline of Marines assigned to MCESG. The Commanding Officer, MCESG also commands those Marines assigned to Headquarters, MCESG, and MCESG regional headquarters, and is the Director, MSG School. MSG School provides suitability screening and formal training for selected Marines to perform duties as MSGs at foreign Service Missions.