Staff Sgt. Monica Bizallion, 11th Security Forces Support Squadron military working dog handler, commands her military working dog, Nirvana, to attack the “suspect”, Staff Sgt. Mark Winning, 11th SSPTS military working dog handler, at Joint Base Andrews, Md., Mar. 12, 2015. Attacking perpetrators is part of the MWD’s training to help protect Andrews’ residents and missions. (U.S. Air Force photo/Airman 1st Class Joshua R. M. Dewberry)