After the book I became very sad when I was watching the movie. I am agree that sometimes a film should be different from the original novel but in this case it was more than acceptable. Some examples:
1) why the ranks are different (e.g. Lt. Diestl instead of Sergeant etc.)
2) the final screen is very poor and makes Diestl as a soldier who feds up himself and wants to die. But it is not true in 100%. Just read the book. He was a bull-dog in the last seconds as well. He did not want to die by wrecking his gun and walking simply towards to Michael & Noah.
So this is some kind of a happy end which does not fit at all for this movie.