U.S. Army Soldiers with the 7th Special Forces Group perform static-line parachute jumps during Emerald Warrior 2015 at Eglin Air Force Base, Fla., April 21, 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)