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So far this is looking like the best answer, just as my own personal opinion. I need to watch some of these movies that others have suggested, because I don't think I have seen some of them. Bridge on the River Kwai and Where Eagles Dare are great.
Das Boot about a German U-boat (submarine) crew is an interesting choice and also a top film.
Yes, that was a great war movie which taught about the immorality of war. So was Stalingrad. Everyone should see Stalingrad. It showed the utter cruelty and brutality of war.