Soldiers assigned to the 1792nd Combat Sustainment Support Battalion conduct chemical, biological, radiological and nuclear (CBRN) training at Camp Atterbury, Indiana, May 21, 2025. The Soldiers practiced donning their protective masks in preparation for entering the gas chamber the following day. The training was part of a larger tactical effort to increase lethality and survivability in contested environments. (U.S. Army National Guard photo by Sgt. Georgia Napier)