LANGLEY AIR FORCE BASE, Va. -- Retired Chief Master Sgt. Bill Christie talks about his career in the Army Air Corps and in the Air Force, during the enlisted dining Dec. 11. Chief Christie was one of the original 625 Chief Master Sgts selected to wear the rank after its introduction in 1959. Those 625 Chiefs are known as Charter Chiefs. (U.S. Air Force photo/Staff Sgt. Jeff Nevison)