This one's new to me and I dont think anyone has mentioned it before - "Combibed Arms Research Library" or CARL at
http://cgsc.leavenworth.army.mil/car...entdm/home.htm
Have not had time to look at even a quater of what's there - seems to be all U.S. - WW1 manuals; WW2 After Action Reports and more.
Noel