Firing ports do have a use though.
Many nations brought out vehicles with firing ports long ago, back in the 60s in fact. One of my favourite vehicles; the MOWAG MR8, had a bunch of them.
What they were for seemed to be building a suppression base if the little vehicle found itself stuck in an area where it couldn't debus its troops. They blazed away as the vehicle sped off. They never actually thought the troops could fight any sort of real fight from inside though.
This is why the original M2's ports still can be useful. A soldier inside sees a figure in a window, he shouts a warning and sprinkles liberally the window with fairly unguided 5.56mm tracer. Everyone knows where the problem is, the possible RPG gunner is deterred and then you can 'make things happen' for a better outcome (ie: someone else throws a grenade though the window).
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