A couple of war documentary themes
Victory at Sea
http://www.youtube.com/watch?v=sto3p3eozg8
And who could ever forget the haunting “World at War” theme
http://www.youtube.com/watch?v=CtB9e_Tev0Q
Another show with great theme music was The Twentieth Century, but in the 1960's, a more insipid version of the music was used.