[clhodapp]

I think it was a joke... You can fire bullets at the tank and the stuff inside is fine.

[valarauca1]

It is, but vehicles including tanks and other armored things use horribly insecure serial protocols for communication. Which is no joke :\

[al2o3cr]

Only for suitably small values of "bullet". :)

[baddox]

Not unless you're defining "bullets" to exclude things like https://en.wikipedia.org/wiki/Depleted_uranium#Ammunition.