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U.S. Air Force Staff Sgt. Joe Burns and military working dog, Ciko, assigned to the 673rd Security Forces Squadron, practice searching for simulated hidden explosives while conducting K-9 training at Joint Base Elmendorf-Richardson, Alaska, March 17, 2016. Military working dog teams are trained to respond to various law enforcement emergencies as well as detect hidden narcotics and explosives. (U.S. Air Force photo/Alejandro Pena)