i didnt use 1 quick save until i got to omahaa beach. just stay behind cover if ur being shot at as soon as the mg's target some1 else move on to the next cover.
There is a walkthrough, for this level, in this very site. Look for the Guides section. If you don't want to spoil all the fun, read only the tips (techniques), in the first part of the walkthrough.
I had to use the walkthrough to get off the boat and onto the beach (who would have known the small piece of metal sticking out of the water in front of the boat can protect you ). Once on the beach, you use common sense and you can get to the bunker without too much trouble.