Master Sgt. Julius Stokes, a flight chief assigned to the 28th Security Force Squadron, directs two team leaders for the next group formation during a training session at Ellsworth Air Force Base, S.D., May 9, 2017. The 28th SFS conducts this training quarterly to keep their skills honed for possible real-world instances. (U.S. Air Force photo by Airman Nicolas Z. Erwin)