"GRISSOM AIR RESERVE BASE, Ind. -- Col. Christopher Amend, left, shakes the hand of Col. William T. ""Tim"" Cahoon after giving him the ""highly coveted"" 434th Operations Group plaque during Cahoon's retirement ceremony here May 20. Amend is the 434th OG commander.  (U.S. Air Force photo/Senior Airman Jami K. Lancette)"