INCIRLIK AIR BASE, Turkey -- U.S. Air Force Col. David Eaglin, 39th Air Base Wing commander, passes the guidon to U.S. Air Force Maj. Joseph Barnum, incoming 39th Comptroller Squadron commander, during a change of command ceremony at Incirlik Air Base, Turkey, June 21, 2018. The passing of the guidon signifies the formal transfer of authority and responsibility from one commanding officer to another. (U.S. Air Force photo by Senior Airman Kirby Turbak)