Staff Sgt. Otto Yan, 28th Security Forces Squadron military working dog trainer, and his dog Xarius, lead the pack at the beginning of the Police Week 5k at Ellsworth Air Force Base, S.D., May 16, 2013. The run started at the Bellamy Fitness Center, looped around the 28th SFS firing range and ended at the BFC. (U.S. Air Force photo by Airman 1st Class Alystria Maurer/Released)