Alot could be done
It's awesome, but I think you should add alot to it. Such as, making it so you have alot more men on D-Day, and they all don't just die on the first wave. Possibly a continuously coming amount of men or something, with some sort of command that the bodies are deleted after 10 seconds, so it won't start to lag eventually. Also, more cover. D-day is almost impossible, especially without men to take the fire for you :-P, anyways, this is very well done, but also, yolu could do a little better on the graphics, though they are good.