My reaction? No Sun Tzu? No Peninsular War in Spain (to include the Spanish guerrilla struggle)? No fiction? (Often you get closer to the truth of things in fiction.) Not even some classics of American military history such as This Kind of War by T.R. Fehrenbach, or The Minutemen by General John Galvin? And, as the reader who forwarded this link to me wrote in the accompanying email:
One caveat, I think it is important to understand freedom first, so that if you are skilled at war you won't use that skill to enable tyranny.
Exactly! This is where such fiction classics as Once An Eagle, Shaara's The Killer Angels, heck, even Rifleman Dodd by C.S. Forrester come in.