A .50-caliber heavy machine gun barrel is placed on the hood of a Humvee during Operation Rolling Thunder, at Fort Bragg, N.C., Oct. 18, 2014. The operation was held in order to better intergrate the ground combat element with the aviation combat element in support of the Marine Air Ground Task Force. (U.S. Marine Corps photo by Lance Cpl. Koby I. Saunders/Released)