I just got back from seeing it and concur with this review.
One thing that really impressed me was the batch of other contemporaneous photos that ran along with the credits at the end. Some moving images - and most of the audience stayed to see them. The final part - after the credits had rolled - was of the dozens of dog tags strung from the memorial that is now in place at the hilltop.
Also, a lot of the film was shot on location on Iwo Jima, which added to the realism.
I believe the film was shot in Iceland, according to the review I saw....completely serious
Yes, I stayed throughout the credits. Very moving, ending with the famous photo. BTW, Clint Eastwood wrote the music, too. Can't say that it was particularly inspiring.