Senior Master Sgt. Timothy Miller, 22nd Operation Support Squadron aircrew flight equipment superintendent, explains the rank insignia to Daniel MacMartin, a former Airman, May 14, 2010 at Century II in downtown Wichita, Kan. The Air Force enlisted rank insignia has evolved many times since becoming an independent service in 1947. McConnell Air Force Base has more than 2,300 enlisted members assigned who support the largest KC-135 Stratotanker base in Air Mobility Command. (U.S. Air Force photo/Tech. Sgt. Chyrece Campbell)
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