Good books to get my military mind thinking?

I am joining the Navy soon and I have really started to enjoy reading again in Particular "The Heart and The First" by Eric Gretins. I was wondering what are some good either autobiography, bios, non fiction, fiction, books about military life, values, human life, war, compion, humanitarianism , ethics, ect...I want a sharp mind as well as body when i join and while im in