Senior Airmen Julian Perez, left, and Thomas Glymph, far right, 36th Security Forces Squadron patrolmen, assist Airman 1st Class Celeste Friedrichs, 736th Security Forces Squadron volunteer, during an active shooter exercise Aug. 26, 2015, at Andersen Air Force Base, Guam. The exercise replicated real-world events and was designed to enhance the training and readiness of first responders to threats to installations and units. (U.S. Air Force photo by Airman 1st Class Alexa Ann Henderson/Released)