Maj. Gen. Sam Barrett takes the 18th Air Force guidon from Gen. Carlton Everhart, and assumes command of 18th AF during a ceremony July 31, at Scott Air Force Base, Ill. Barrett comes to 18 AF from his position as the Director of operations, Strategic Deterrence and Nuclear Integration, Headquarters Air Mobility Command, Scott AFB. (U.S. Air Force photo by Airman 1st Class Chad Gorecki)