MUSAYYIB, Iraq—Fighting insurgents with tanks and guns is only half the battle for Sierra Vista native Capt. Irvin Oliver. As a Company Commander in the 2nd Brigade of 4th Infantry Division, Oliver learned that in Iraq it requires more than bullets to defeat insurgents. On July 22, during a routine patrol in Musayyib, Oliver’s soldiers came under fire. The fight lasted an afternoon and escalated to point where most of his battalion was called in. When the fight was over, 33 insurgents were killed. U.S. soldiers received only minor injuries. Oliver, 32, was assigned Musayyib as his company’s area of...