Airman 1st Class Matthew Hung adjusts his gas mask before participating in an emergency management exercise, June 3, 2010, at Ellsworth Air Force Base, S.D. Airmen here performed various scenarios involving chemical, biological, radiological and nuclear detection and decontamination operations. Airman Hung is an emergency management journeyman with the 28th Civil Engineer Squadron.
U.S. Air Force photo/Airman 1st Class Corey Hook
November 4, 2012
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