Senior Airman Donald Maas, 436th Security Forces Squadron raven, stands guard in the George S. Welch Elementary School during an active shooter exercise Feb. 26, 2018, at Dover Air Force Base, Del. Every member of Security Forces, no matter the rank, is responsible for knowing and understanding the response procedures in the event of a real-world active shooter. (U.S. Air Force photo by Airman 1st Class Zoe M. Wockenfuss)

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