Tech. Sgt. Robert Calhoun, 341st Security Forces Squadron military working dog trainer, right, and Staff Sgt. David Nierzwicki, 341st Security Forces military working dog handler, and his MWD Zsabi, preform bomb detection training at the base headquarters April 16, 2015, at Malmstrom Air Force Base, Mont. During the two nights of training the team checked vehicles and buildings looking for any possible threats. (U.S. Air Force photo/Chris Willis)