A U.S. Army CH-47 Chinook helicopter is refueled by an Air Force MC-130H Combat Talon aircraft, not shown, during Emerald Warrior 2013 at Hurlburt Field, Fla., May 1, 2013. Emerald Warrior is an annual two-week joint/combined tactical exercise sponsored by U.S. Special Operations Command designed to leverage lessons learned from operations Iraqi and Enduring Freedom to provide trained and ready forces to combatant commanders. (U.S. Air Force photo by Senior Airman Matthew Bruch/Released)