That was great
My only complaint is the use of Linkin Park and Stained in a WW2 flash, it clashed with the setting. But, I can't fault you for using music I happend to dislike.
Other than that is was amazing. I was paticularly impressed with the accuracy of the weapons. They all looked and functioned as they do in the real world.
I'm hoping for some character developement though. At first it seemed you had some central characters, such as the sniper in the begining. But once the fighting started I couldn't tell anyone apart.
There is potential here for a truely epic flash series. I can't wait for part 2. :)