In this Aug. 14, 2012 photo, a ground crew member works below a U.S. Air Force KC-135 Stratotanker, as another KC-135 is seen in a hanger behind, at Kadena Air Base on Japan's southwest

 

              In this Aug. 14, 2012 photo, a ground crew member works below a U.S. Air Force KC-135 Stratotanker, as another KC-135 is seen in a hanger behind, at Kadena Air Base on Japan
In this Aug. 14, 2012 photo, a ground crew member works below a U.S. Air Force KC-135 Stratotanker, as another KC-135 is seen in a hanger behind, at Kadena Air Base on Japan's southwestern island of Okinawa. The most recent of the KC-135 refueling tankers currently in service started flying in 1964. For decades, the U.S. Air Force has grown accustomed to such superlatives as unrivaled and unbeatable. Now some of its key aircraft are being described with terms like decrepit. (AP Photo/Greg Baker)