U.S. Air Force Col. James Zirkel, 39th Weapons System Security Group commander, left center, passes the guidon to Lt. Col. Christopher Sheffield, 39th Security Forces Squadron incoming commander, right center, June 26, 2017 at Incirlik Air Base, Turkey. The ceremony, rooted in military tradition, signified the transition of command. (U.S. Air Force photo by Airman 1st Class Kristan Campbell)