A HH-60M MEDEVAC flown by Soldiers with the 2-501st General Support Aviation Battalion (GSAB), 1st Armored Division, based in Ft. Bliss, Texas, soar above the landing zone during Guardian Response 18 at Muscatatuck Urban Training Center, Ind., April 20, 2018. More than 4,500 Soldiers from across the country are participating in Guardian Response 18, 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. (U.S. Army Reserve photo by Staff Sgt. Christopher J. Sofia, 78th Training Division)