In this Aug. 14, 2012 photo, a ground crew member walks towards 

In this Aug. 14, 2012 photo, a ground crew member walks towards the tail of a U.S. Air Force KC-135 Stratotanker protruding from a hanger 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)
Associated Press
In this Aug. 14, 2012 photo, a ground crew member walks towards the tail of a U.S. Air Force KC-135 Stratotanker protruding from a hanger 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)
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