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., Marine Air Wing. A USMC organization that provides combat ready expeditionary aviation forces capable of short notice world wide deployment to MAGTF, fleet, and unified commanders., and Marine Logistics Group.