Nina, 460th Security Forces Squadron military working dog, looks through her cage before a training exercise March 20, 2013, at a training facility on Buckley Air Force Base, Colo. The 460th SFS hosted a K-9 training exercise that included participation from the 460th SFS, Jefferson County Sheriff’s Office, Denver Sheriff Department and Transportation Security Administration. (U.S. Air Force photo by Airman 1st Class Riley Johnson/Released)