A U.S. Army Reserve Soldier from the 414th Chemical Company out of Orangeburg, South Carolina, assesses a casualty role player at a trailer park training area in Muscatatuck Urban Training Center (MUTC) in Butlerville, Indiana, May 10, 2017. Nearly 4,100 Soldiers from across the country are participating in Guardian Response 17, a multi-component training exercise to validate U.S. Army units’ ability to support the Defense Support of Civil Authorities (DSCA) in the event of a Chemical, Biological, Radiological, and Nuclear (CBRN) catastrophe.