U.S. Army Sgt. Khawaja Rivera, assigned to the 561st Military Police Company in Fort Campbell, Kentucky, secures a simulated injured patient during Guardian Response 22, Muscatatuck Urban Training Center, Indiana, May 7, 2022. Guardian Response 22 is a training exercise designed to test unit readiness and responsiveness to nuclear response scenarios. (Photo by U.S. Army Sgt. Jermaine Jackson)