INCIRLIK AIR BASE, Turkey -- U.S. Air Force Maj. Joseph Barnum, incoming 39th Comptroller Squadron commander, gives his welcoming speech during a change of command ceremony at Incirlik Air Base, Turkey, June 21, 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 Senior Airman Kirby Turbak)