An E-3 Sentry, also known as airborne warning and control system or AWACS, from the 963rd Expeditionary Airborne Air Control Squadron maneuvers into position to be refueled by a KC-135 Stratotanker from the 340th Expeditionary Air Refueling Squadron over Afghanistan in support of Operation Enduring Freedom, May 21, 2011. AWACS provides situational awareness of friendly, neutral and hostile activity, command and control of an area of responsibility, battle management of theater forces, all-altitude and all-weather surveillance of the battle space, and eraly warning of enemy actions during joint, allied, and coalition operations.