Tech. Sgt. Mark R. Corrigan, a loadmaster assigned to the 317th Airlift Squadron at Joint Base Charleston, S.C., makes final preparations on palletized cargo during a recent training mission. Aircrews from the 437th and 315th Airlift Wings at Joint Base Charleston conducted a large formation exercise (LFE) consisting of 13 C-17 Globemaster III aircraft Wednesday, April 9, 2013. The mission included a variety of training exercises consisting of airdrops, aerial refueling and low level tactical training. These skills are needed at all times to ensure mission readiness, locally and globally. (U.S. Air Force photo/Senior Airman Bobby Pilch)