U.S. Army Soldiers from 2nd Battalion, 9th Cavalry Regiment use a sledge hammer and guide pin to knock out a bent pin to a track on an M2A2 Bradley Fighting Vehicle in the Salah Ad Din province of Iraq March 18, 2006. The vehicle was being used at blocking points to help stop the escape of insurgents during Operation Swarmer. The operation is a combined air assault operation to clear the area northeast of Samarra of suspected insurgents. (U.S. Army photo by STAFF SGT. Alfred Johnson) (Released)