This includes motor vehicle support, mobile electric power, heavy equipment, tactical aviation refueling, essential runway services, and second echelon maintenance.

They are tasked to conduct airfield operations, less air traffic control, for supporting Aviation Combat Element units to include: internal airfield communications, weather, services expeditionary airfield services, crash/fire/rescue and structural fire fighting services, aircraft and rapid ground refueling, motor transport for operations internal to air base messing facilities, routine and emergency sick call and aviation medical functions, individual and unit training of organic personnel and personnel of selected support units, organic nuclear, biological and chemical (NBC) defense, security and law enforcement services Marine Wing Support Squadron 373 (MWSS-373) can trace its lineage back to Wing Equipment and Repair Squadron 37 (WERS-37) activated on 1 April 1967 at Marine Corps Air Station El Toro, Santa Ana, California.

On 31 January 1977, WERS-37 was restructured and re-designated as Wing Transportation Squadron 37 (WTS-37) as a result of the Marine Corps wide Combat Service Support reorganization concept, effected 5 June 1986.

From 19 August 1995 to 19 October 1995, MWSS-373 also deployed an Offload Preparation Party detachment of 11 Marines to the 15th MEU(Marine Expeditionary Unit) as part of Operation Vigilant Sentinel a larger U.S. effort to deter Iraqi interference with United Nations' arms inspections and in response to claims by high-ranking military defectors of the Iraqi armed forces that Saddam Hussein was massing forces near the Kuwaiti border.

During March 2003 MWSS-373 conducted FARP operations (Forward Arming and Refueling Point) in the vicinity of Jalibah Airfield, Iraq in support of the attack on An Nasiriyah.

Additionally, MWSS-373 numerous road improvement projects, helicopter landing zone installations, and facility electrical renovations at sites throughout the Euphrates River corridor between Ar Ramadi and Al Fallujah.

They also completed numerous Helicopter Landing Zone improvement projects across the Helmand province and finalized the construction of a C-130 air strip in Forward Operating Base Delaram.