ELLSWORTH AIR FORCE BASE, S.D. -- Staff Sgt. Curtis Lock, 28th Security Forces Squadron military working dog handler, plays the role of a decoy for Artos, Aug. 13. Handler’s challenge the dogs in multiple exercises in the course, which is a no-blouse, no-hat area, to help the dogs adapt to different situations they may encounter while carrying out their duties. (U.S. Air Force photo/Airman Corey Hook)