Everything that everyone has said before, and most Robert Heinline books. Especially Farnhams Freehold, Starship Troopers, Friday, Stranger in a strange land and anything with Lazurus Long in it.
Jerry Ahern - The Freeman
All the Mack Bolan books, hundreds, like watching a good B movie.
Non fiction, Elmer Keith, Bill Jordan, Skeeter Skelton, Charles Askins, Rex Applegate, and of course Uncle Jeff Cooper, and Herbert McBride. This list is actually very short, but you will not be disappointed..