Soldiers with the 51st Chemical Biological Radiological Nuclear Company prepare to treat victims at a decontamination field site during Guardian Response 17 at the Muscatatuck Urban Training Center, Ind., April 27, 2017. Guardian Response, as part of Vibrant Response, was a multi-component training exercise run by the Army Reserve designed to validate nearly 4,000 service members in Defense Support of Civil Authorities (DSCA) in the event of a Chemical, Biological, Radiological and Nuclear (CBRN) catastrophe.

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Photo credit: © Ted Small / Alamy / Afripics
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