U.S. Air Force Senior Master Sgt. Gwen Crabtree, 451st Expeditionary Logistics Readiness Squadron (deplolyed from the 38th Aerial port Squadron), prepares an A-22 cargo bag before a UH-60 Black Hawk helicopter conducts an in-flight cargo sling load during a joint-coalition training mission at Kandahar Airfield, Afghanistan, June 1, 2013. The training provided coalition members the opportunity to learn the concepts of marking a landing zone as well as in-flight cargo sling loading. (U.S. Air Force photo/Senior Airman Scott Saldukas)