MUSCATATUCK URBAN TRAINING CENTER, Indiana – Spc. Lesymar Aviles from Sabana Grande, Puerto Rico, an ammunition stock control specialist with the 266th Ordnance Company, Aguadilla, Puerto Rico, sprays paint to simulate a burn wound onto a civilian volunteer at the Muscatatuck Urban Training Center (MUTC), Indiana, May 6, 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.