A Marine Expeditionary Force or MEF (formerly known as a Marine Amphibious Force) is the largest type of a Marine Air-Ground Task Force. A MEF is the largest building block of United States Marine Corps combat power.
A MEF is larger than a Marine Expeditionary Unit or Marine Expeditionary Brigade. Each MEF consists of a division as the ground combat element, a aircraft wing as the aviation combat element, and a logistics group as the logistics combat element.
A MEF also commands several smaller MAGTFs, includeing MEBs and MEUs.
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