Mass Casualty Training A soldier treats another soldier with a simulated back injury during a mass casualty exercise at the Joint Readiness Training Center, Fort Polk, La., July 16, 2016. The soldier perfoming the treatment is assigned to the New York Army National Guard's Headquarters Company, 1st Battalion 69th Infantry. Army National Guard photo by Sgt. Harley Jelis SHARE: Download: Full Size (1.81 MB) Tags: army national guard, soldiers Credit: Sgt. Harley Jelis VIRIN: 160716-Z-AR422-067A.JPG Photo Gallery