U.S. Army soldiers from 2nd Battalion, 9th Cavalry Regiment in a M2A2 Bradley and a M1114 Armored Vehicle provide security at Blocking Point 21 during Operation Swarmer, Northeast of Samarra, March 17, 2006. Blocking points were established around the main objective area during the operation to block any insurgent escape route while coalition forces searched for weapon caches and Anti-Iraqi forces. (U.S. Army photo by STAFF SGT. Alfred Johnson) (Released)