Tom Zbikowski, Fort Walton Beach, Fla., Police Department SWAT team member, walks the hallways in Campbell Township Elementary School at the Muscatatuck Urban Training Center, Butlerville, Ind., while portraying an active shooter during the 2015 Air Force Research Laboratory Commanders Challenge, June 15-19. Four members from the SWAT team participated in the challenge playing the role of emergency responders in addition to the active shooter. (U.S. Air Force photo by Wesley Farnsworth)