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U.S. Air Force Col. Jeffery Valenzia, 93d Air Ground Operations Wing commander, hands the guidon to Col. Kevin Walker, incoming 820th Base Defense Group commander, during a change of command ceremony, July 7, 2016, at Moody Air Force Base, Ga. Walker joins the 820th BDG after earning his Master of Science degree in National Security Strategy from the National War College at Ft. Lesley J. McNair, Washington, D.C. (U.S. Air Force photo by Airman 1st Class Lauren M. Hunter/Released)