U.S. Marine Corps air traffic controllers with the Marine Air Control Squadron 1 and Army air traffic controllers with the 58th Aviation Regiment set up a security area during an Emerald Warrior 2015 airdrop mission at Marianna Municipal Airport, Fla., April 22, 2015. Emerald Warrior is the Department of Defense's only irregular warfare exercise, allowing joint and combined partners to train together and prepare for real-world contingency operations. (U.S. Air Force photo by Staff Sgt. Jamal D. Sutter/Released)