Staff Sgt. Britney Simpson, 47th Security Forces Squadron military working dog handler, runs her partner, Eewok, through an obstacle at Laughlin Air Force Base, Texas, April 16, 2013. Laughlin’s dog handlers run their four-legged companions through obstacle courses to keep them fit and well-trained. (U.S. Air Force photo/Airman 1st Class John D. Partlow)