GRISSOM AIR RESERVE BASE, Ind., -- Chief Master Sgt. Glen Johnson, the heating ventilation, air conditioning and refrigeration superintendent for the 434th Civil Engineers Squadron, addresses the crowd at the quarterly promotion ceremony. Chief Johnson, was one of three unit members to be promoted to the rank of chief master sergeant during the ceremony. (U.S. Air Force photo/Tech. Sgt. Pat Kuminecz)
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