He won’t go to hell because he served as a Marine in the Pacific in WWII. When he gets to heaven a few Marines might ask him if he had any idea that the political party he belonged to was ultimately going to bring the kind of despots to power that he risked his life to help defeat.
Your theological ignorance is outstanding. Are you going to nominate Lee Harvey Oswald for sainthood? Or will you reserve that for John "Jack" Murtha.