Closing With The Enemy: How the GIs fought the War in Europe 1944-45: I've read and re-read that book about a dozen times. It also explodes the myth "The GIs stank as infantrymen." and it showed that when doctrine failed, the American GI was flexible enough to improvise solutions, and how the Army as a whole became a clearing house in dispensing the information on said solutions throughout the Army. It also demonstrates how the Army began to realize that it needed to teach junior officers some sense of self-preservation, as too many of them were exposing themselves needlessly...
http://www.michaeldoubler.com/Closing.htm