Ground Combat Element. 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. component usually comprised of infantry and supported by armor (tanks), and artillery. May also include special units such as scouts or Force Reconnaissance, snipers and Joint Terminal Attack Controller. A qualified service member, often an aviator, who directs the action of combat aircraft engaged in close air support and other offensive air operations from a forward position.s.