A KC-135 Stratotanker, deployed from Royal Air Force Mildenhall, England, refuels an F-15C Eagle, deployed from RAF Lakenheath, England, while flying an alert mission exercise with the 493rd Expeditionary Fighter Squadron in Iceland May 22, 2012. The squadron, made up of both U.S. Air Force and NATO personnel, is fulfilling an air policing mission that assists in assuring Iceland's air sovereignty. (Courtesy photo)