Sorry Bomer, but I think you're missing the point: it isn't a simple matter of "I don't let him (the tank) in...". You're good, but nobody's that good. And there's nothing wrong with "smart" design solutions to improve the quality of the game. That's why they're called "smart", because they work. A WWII tank with unlimited ammo that can, occasionally, sneak through and completely ruin everyone's fun is not some sort of challenge, it's poor game design and needs to be fixed.
Two more rapist names for the blacklist: park.j.h. and ) .. (