![](http://www.alamy.com/thumbs/6/6711094D-DBFD-4BB9-9179-2276EB22D073/2GKHJ34.jpg)
A manikin lays idly during a mass decontamination event during Exercise Guardian Response 21 at Muscatatuck Urban Training Center, Ind., April 23, 2021. Guardian Response is a multi-component Homeland Emergency Response Exercise run by the Army Reserve's 78th Training Division.
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Keywords: 21, affairs, army, gr, gr21, public, reserve, usarc