Staff Sgt. Christopher Cumming, C-17 Globemaster III loadmaster, explains cargo flight operations to guests at Africa's largest air show Sept. 20, 2014. Cumming and a total force team of U.S. Air Force Airmen and U.S. Army Soldiers attended the Africa Aerospace & Defence Expo 2014 at Waterkloof Air Force Base, South Africa, to showcase the United States' commitment to its partnership with South Africa. (U.S. Air Force photo by Tech. Sgt. Austin M. May/Released)