U.S. Air Force Lt. Col. Christopher Diller assumes command of the 509th Operations Support Squadron with the ceremonial hand off of the unit guidon to U.S. Air Force Col. Keith Butler, 509th Operations Group commander, at Whiteman Air Force Base, Missouri, April 23, 2021. The change of command ceremony is a military tradition that formally signifies the transfer of responsibility for a unit from one commanding officer to another, symbolized through the passing of a guidon. (U.S. Air Force photo by Airman 1st Class Victoria Hommel)
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