C. Donatell and M. Miller, both El Paso County Sheriff’s Office Special Weapons and Tactics deputies clear a building during an active shooter exercise at Schriever Air Force Base, Colorado, Wednesday, June 7, 2017. Opinicus Vista 17-2, which ran May 30-June 8, is Schriever’s largest exercise of the year and coordinated efforts between Schriever Air Force Base and local area first responders to engage a wildfire and active shooter with a hostage scenario.

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