Plus being a 1957 movie (I just checked the date on the internet), it is a more sterilized version of how things would be said. I doubt if it was made today the captains would be calling each other "devils," and while I have nothing against strong cuss words IN APPROPRIATE SITATUATIONS a good deal of the movies today use them simply to guarantee getting the rating they want. PG? "Oh, make sure the cute kid uses this mild cuss word a few times, it'll get a laugh and insure we don't get a G rating." R? "Well, you need a few of these words and sprinkle some of the really strong words in there too. Hmm, that character can say it in that scene where it will emphasize how happy he is." (When I resort to cussing, it is *never* when I'm in a good mood).
Hmm, there I go digressing on something I find acidic yet again. I guess I just like vinegar digressing on my salads, ... er, in my essays (sorry, couldn't resist the pun). I guess my point has been made too. I like the movie "The Enemy Below," and very few other movies dealing with war.