Lt. Col. Sarah Evans, 39th Medical Operations Squadron outgoing commander, right, passes the guidon to Col. Christopher Estridge, 39th Medical Group commander, during the change of command ceremony June 7, 2019, at Incirlik Air Base, Turkey. The passing of the guidon symbolizes one commander relinquishing command and all of the responsibilities to the incoming commander. (U.S. Air Force photo by Staff Sgt. Matthew J. Wisher)