Senior Airman Anthony Glanton, left, clears the 310th Space Wing headquarters building with Senior Airman Arik Leiker trailing behind to protect his back during an active shooter exercise on Nov. 7. Shawn O'Reilly, right, the trainer and the bad guy in the exercise, waits to surprise the advancing security forces Airmen. O'Reilly worked with the members of the security forces squadron on two-man and three-man active shooter scenarios during the unit training assembly. (U.S. Air Force photo/Tech. Sgt. Scott P. Farley)