U.S. Air Force Staff Sgt. Alden Dunn, 99th Security Forces Squadron military working dog handler, plays the role of an aggressor while Staff Sgt. Janna McDonald, 99th Security Forces Squadron military working dog handler, handles Chester, military working dog, during Retiree Appreciation Day, Sept. 15, 2012, at Nellis Air Force Base, Nev. Approximately 810 individuals attended the event. (U.S. Air Force photo by Airman 1st Class Matthew Lancaster)
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