Marine Expeditionary Force. A Marine Air Ground Task Force. A principal United States Marine Corps organization that combines air-, land-, and sea-borne forces to conduct a wide array of military operations and humanitarian responses anywhere in the world. Comprised of a CE, ACE, GCE, and LCE. May take the form of a MEB, MEF, or MEU. comprised of a MEF Headquarters Group, Marine aka Four-ship. A coordinated flight of four aircraft operating in close proximity to one another., Missile Approach Warning. An aircraft avionics system that detects attacking missiles and alerts the crew., and Marine Logistics Group.