Tech. Sgt. Brett McVay, fuels cell technician, investigates a potential fuel leak in the aft boost pump in the wing of a KC-10 Extender on April 14, 2011, at a base in Western Europe. Sergeant McVay is deployed here with the 313th Air Expeditionary Wing from the 349th Air Mobility Wing, Travis Air Force Base, Calif., in support of Operation Unified Protector. Operation Unified Protector is a NATO-led mission in Libya, to protect civilians and civilian-populated areas under threat of attack. The 313th AEW provides aerial refueling to U.S. and coalition aircraft with KC-135 Stratotankers and KC-10s. (U.S. Air Force Photo/Senior Airman Ethan Morgan)