A U.S. airman parachutes to the ground during high-altitude, low-opening jump training at Bagram Airfield, Afghanistan, July 18, 2015. Green smoke marks the drop zone to guide the pararescuemen to their landing point. The airman is a pararescueman assigned to the 83rd Expeditionary Rescue Squadron, which has a mission to rescue, recover and return American or allied forces in times of danger or extreme duress.