Unwinnable
A bit novel for a while, but then I just hired a bunch of guys to nearly freeze up my browser. I just gave up at about a quarter of the way to the amount required for the nuke. Great job coming up with something that requires ridiculous amounts of crap flying across the screen all at once and implementing it in *Flash*.
Do those casings (from the machine guns) ever go away? I suspect that the piles contributed to the slowdown, but that's just a guess. It doesn't really matter to me at this point because there are several ways this problem could've already been dealt with.