The attached article weighs the way infantry basic training was conducted at the beginning of the war and how it had changed as the war progressed, evolving into something a bit different by 1945. The training period was originally a 13 week cycle in 1941, yet in time after carefully watching the soldiers in the field and finding that infantrymen needed a broader understanding of the tools at hand, the infantry training at Camp Wheeler, Georgia, had been extended an extra two weeks. One of the obvious factors involved a far wider pool of combat veterans to rely upon as instructors.
This article was used to support a point in an honors thesis at the Army Command and General Staff College.
You might also like to read this article about W.W. II cavalry training.
Statistical data concerning the U.S. Army casualties in June and July of 1944 can be read in this article.