Air Force Senior Airman Abimael Santiago, left, and Senior Master Sgt. Mike Green, both flight engineers with the 9th Airlift Squadron, work together during the chemical mask session of a Chemical Biological Radiological and Nuclear survival skills training class Aug. 9, 2012, at Dover Air Force Base, Del. The 436th Civil Engineer Squadron emergency management and training section provided training to all active-duty personnel. Roland Balik

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Photo credit: © Z2A1 / Alamy / Afripics
License: Licensed
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