39th MDOS welcomes new commander Published June 8, 2018 By Staff Sgt. Jason Huddleston, 39th Air Base Wing Public Affairs INCIRLIK AIR BASE, Turkey -- U.S. Air Force Col. Christopher Estridge, 39th Medical Group commander, passes the guidon to Lt. Col. Sarah Evans as she assumes command of the 39th Medical Operations Squadron, during a formal ceremony at Incirlik Air Base, Turkey, June 8, 2018. (U.S. Air Force photo by Staff Sgt. Jason Huddleston)