Das Boot is probably the most realistic war movie ever made. I have done extensive study on the subject of WW2 U boats and could fine no glaring errors in the movie.
U 571 was terrible. It was stupid, unrealistic and boring. Total hollywood garbage IMO.
Saving Private Ryan - VG movie.
Also, if you folks enjoy realism, go and rent/buy 12 O'Clock High. Forget Memphis Belle - this is how is REALLY was. Very good movie!!!
Also have to mention:
The One that Got Away
Bridge Over River Kwai
"The Americans will always do the right thing... After they've exhausted all the alternatives." Winston Churchill
"Power corrupts, and absolute power corrupts absolutely." Lord Acton
"If I had to choose a religion, the sun as the universal giver of life would be my god." Napolean Bonaparte
"In the absence of orders...go find something and kill it." Erwin Rommel