U.S. Air Force Airman 1st Class Blake Crowell, 60th Security Forces Squadron installation patrolman, assumes a defensive position during a base exercise Sept. 24, 2020, at Travis Air Force Base, California. The exercise was designed to evaluate 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)
28.0-300.0 mm f/3.5-5.6
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