U.S. Air Force Col. Christopher Estridge, 39th Medical Group commander, presents the guidon to Lt. Col. Thomas “Jason” Telfer, 39th Medical Support Squadron commander, during a change of command ceremony at Incirlik Air Base, Turkey, June 8, 2018. A change of command ceremony is a tradition that represents a formal transfer of authority and responsibility from the outgoing commander to the incoming commander. (U.S. Air Force photo by Staff Sgt. Jason Huddleston)