A U.S. Air Force E-3 Sentry from the 965th Airborne Air Control Squadron approaches a KC-135 Stratotanker from the 964th Airborne Air Control Squadron, both assigned to Tinker Air Force Base, Okla., to refuel during Red Flag 12-4 July 20, 2012, over the Nevada Test and Training Range. The Sentry provides all-weather surveillance, command, control and communications during the exercise. (U.S. Air Force photo by Airman 1st Class Daniel Hughes)
