A Marine Expeditionary Force, (abbreviated MEF in military code) is a large organization of Marines. It is unclear exactly what a Marine Expeditionary Force consists, but it contains at least one Division sized unit of Marines and an Air Wing and a Logistics Group, although likely much more.[1]

An MEF is likely the same or similar to the Expeditionary Forces of the 20th century. One example of which was the 1st Marine Expeditionary Force of the US Marine Corps, who were separated into a the 1st Marine Division, the 3rd Marine Aircraft Wing and the 1st Marine Logistics Group. Overall, an MEF is designed to be self-sustaining, already covering important requirements such as a large number of troops, an Air defence, and spare men required for maintenance, treating wounded and delivering supplies.

Known Marine Expeditionary ForcesEdit



  1. Halo: Contact Harvest, page 111