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Twenty-three delayed enlisted members affirm their commitment to join the Air Force as NASA prepares space shuttle Endeavour for its final mission into space at Cape Canaveral Mar. 22. Navy Capt. (ret.) Jon McBride, former NASA astronaut, presided over the delayed enlistment ceremony. Endeavour has flown 25 missions since 1992. (U.S. Air Force photo/Master Sgt. Elizabeth Valentine)