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2nd Lt. Charles Heim, 47th Civil Engineer Squadron officer in charge of emergency management, secures his gas mask during a chemical, biological, radiological and nuclear training course at Laughlin Air Force Base, Texas, Sept. 12, 2013. During the course, attendees had a hands-on approach as to what may be required of them for protection during a CBRN attack. (U.S. Air Force photo/Senior Airman John D. Partlow)
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