Automated in the sense of "don't need a person standing in a tower", not in the sense of "needs no maintenance". I suppose minefields might be the latter, but e

Automated in the sense of "don't need a person standing in a tower", not in the sense of "needs no maintenance". I suppose minefields might be the latter, but even then I'd argue that minefields are less "needs no" and more "can receive no, since they'd kill the maintenance personnel". (And if you're running out of ammo, you'd need to add more mines too)