Master Sgt. Dominic Perlich, team leader with the 169th

Master Sgt. Dominic Perlich, team leader with the 169th Security Forces Squadron, subdues a simulated armed assailant played by Staff Sgt. Jason Fisher during an Active Shooter exercise as Master Sgt. Ralph Guyton provides overwatch at McEntire Joint National Guard Base, S.C., Dec. 3, 2011. The overall goal of the exercise was to assess and improve emergency public safety and security, public information, communication and warning systems, incident command and incident management, and mass-casualty response.