Aerial view of Tactical Air Control Center being used for Marine Expeditionary Force Exercise (MEFEX) on Osan Air Force Base, South Korea, March 15, 2014. MEFEX will enhance the interoperability between the U.S. Marine air ground task force and the Republic of Korea Marine task force while honing amphibious capabilities of each nation's Navy and Marine Corps. (U.S. Marine Corps photo by Lance Cpl. Richard Currier, 1ST MAW Combat Camera/Released)