ELLSWORTH AIR FORCE BASE, S.D. -- Senior Airman Nathaniel Johnson, 28th Security Forces Squadron military working dog handler, leads "Rex" through an obedience and patrol training course, Aug. 13. The course which is a no-blouse, no-hat area is designed to build the dog’s confidence and train for various environments and situations. (U.S. Air Force photo/Senior Airman Marc I. Lane)