U.S. Army Pfc. Sean P. Stieren, a rifleman with A Company, 1st Battalion, 509th Infantry Regiment (Airborne), scans for enemy aircraft at the Joint Readiness Training Center in Fort Polk, La., April 19, 2014. Paratroopers with 1st Bn., 509th Inf. Reg. (A), act as insurgent and conventional opposing forces during decisive action training environment exercises at JRTC. (Photo by U.S. Army Staff Sgt. Christopher Klutts, 20th Public Affairs Detachment)