ELLSWORTH AIR FORCE BASE, S.D. - (From left) Senior Airmen Jonathan Byron, Chadwick Richardson and Isaac Bliek demonstrate how the 28th Security Forces Squadron utilizes barriers to block road access into the play areas. Play areas are used during exercises to allow Airmen an area to practice their skills in a warlike environment. Crossing these barriers without authorization disrupts base exercises and interrupts crucial training. All three Airmen are Security Forces leaders in the 28th SFS. (U.S. Air Force photo by/Tech. Sgt. Nathan Gallahan)