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(Top Left) Staff Sgt. Zackery Leist, 88th Security Forces Squadron military working dog handler, and MWD Bulit perform detection training May 2 in a “subway car” on Muscatatuck Urban Training Center, Indiana. (Bottom Left) Staff Sgt. Zachery Leist, 88th Security Forces Squadron military working dog handler, and MWD Bulit perform detection training May 3 in a “hospital” on Muscatatuck Urban Training Center, Indiana. (Top Right) Staff Sgt. Zackery Leist, 88th Security Forces Squadron military working dog handler and MWD Bulit, perform detection training May 2 in a “prison” on Muscatatuck Urban Training Center, Indiana. (Bottom Right) Bulit, 88th Security Forces Squadron military working dog, sniffs for potential threats during his detection training May 3 on Muscatatuck Urban Training Center, Indiana. Guardian Response 23 is a joint service military and multi-component exercise focused on domestic disaster response. (U.S. Air Force photo by Hannah Carranza)