A KC-135 Stratotanker from Royal Air Force Mildenhall, England, refuels a pair of F-16 Fighting Falcons April 7 during a multinational exercise over the Baltic States. The Stratotankers from RAF Mildenhall feature the "Box D" tail marking, dating back to World War II. (U.S. Air Force photo/Staff Sgt. Jerry Fleshman)