An Airman assigned to the 355th Security Forces Squadron fires an M4A1 carbine during beta testing of the Air Force Security Forces Centers' proposed weapons qualification course at Davis-Monthan Air Force Base, Arizona, Aug. 11, 2021. In the course, Defenders fire from various positions to simulate an active shooter incident. (U.S. Air Force photo by Senior Airman Alex Miller)
28.0-300.0 mm f/3.5-5.6
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