From the US Army Combined Arms Center Research Library.

There's material such as Block by Block: The Challenges of Urban Operations, Guide to the Study and Use of Military History, Cannae for the Rome-lovers (or haters), Future of War (which is actually a century old, making it really cool), Historical Perspective on Light Infantry for the...light infantry fans, and Atlas of the Sioux Wars for the Megas Methuselahs.