U.S. Air Force Airman 1st Class Hallie Dickens, 325th Civil Engineer Squadron emergency manager, checks the seal on a gas mask at Tyndall Air Force Base, Florida, Oct. 28, 2021. Dickens teaches a weekly Chemical, Biological, Radiological and Nuclear defense course to Airmen who are preparing to deploy. (U.S. Air Force photo by Airman 1st Class Tiffany Price)
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