Can you be a bit more specific as to period, geographic area, area of interest? It helps to know whether you are interested in the Revolutionary war, the War of Northern Aggression, Tejano Independence, Roman Empire, etc.
"The Savage Wars of Peace," by Max Boot. It is the story of America's small wars that has little presence in today's history books. It is a great book, easy read, and you will thank me later.
"Gare le Bete (Beware the Beast), A History of the 814th Tank Destroyer Battalion, 1942-1945" by the late Calvin C. Boykin, Jr. Contact me if you are interested. I am marketing this now for my dad and the contact info has changed.