A U.S. Air Force KC-135 refuels an E-3 Sentry in air during Exercise Cope Tiger 15 near Korat, Thailand, March 12, 2015. CT15 includes 22 total flying units and over 1,390 personnel from three countries and continues the growth of strong, interoperable and beneficial relationships within the Asia-Pacific region through integration of airborne and land-based command and control assets. (U.S. Air Force photo by Airman 1st Class Taylor Queen/Released)