GRISSOM AIR RESERVE BASE, Ind. -- Col. William T. "Tim" Cahoon presents Staff Sgt. Aaron Preston with a certificate of promotion as he is inducted into the noncommissioned officer ranks during the November unit training assembly. Sergeant Preston is a KC-135R Stratotanker crew chief with the 434th Aircraft Maintenance Squadron. Colonel Cahoon is the 434th Air Refueling Wing commander. (U.S. Air Force photo/Senior Airman Carl Berry)
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