U.S. Air Force Senior Airman Dalton Short, right, 60th Security Forces Squadron installation patrolman, and Airman 1st Class Blake Crowell, 60th SFS installation patrolman, gain entry to a building to search for threats during a base exercise Sept. 24, 2020, at Travis Air Force Base, California. The exercise was designed to enhance the training, readiness and capability of Travis first responders in order to effectively respond to active shooter threats to the installation. (U.S. Air Force photo by Heide Couch)