U.S. Soldiers with 1st Platoon, Delta Company, 1st Battalion, 5th Cavalry Regiment., 2nd Brigade Combat Team, 1st Cavalry Division, set up security outside their vehicle during the rehearsal for a live-fire convoy operations training exercise at Fort Polk, La., May 5, 2011. (U.S. Army photo by Spc. Bradley J. Wancour/Released)