What defines the Marine Expeditionary Force (MEF)?

The Marine Expeditionary Force (MEF) is defined as a major amphibious force capable of conducting sustained operations. This means it is designed to project power from the sea, conducting large-scale operations and supporting various types of missions, including combat, humanitarian assistance, and disaster relief. The MEF typically includes a ground combat element, an aviation combat element, and a logistics combat element, allowing it to operate effectively and independently for extended periods.

This definition takes into account the MEF's primary purpose of amphibious operations and its ability to adapt to a full range of military operations, making it a versatile and formidable force in both combat scenarios and peacekeeping missions. The capabilities of the MEF are critical for responding rapidly to crises and ensuring a robust presence in areas of interest to U.S. national security.