re: US Air Force finally retires 8-inch floppies from missile launch control system

Archaic technology that is airgapped and is buried 100 feet into rock is fricking SECURE. You've got to get physical access to the equipment to do anything with it and not too many people go around the silos without being noticed. Even if you do get close to it, you've got to use old technology that is way harder to hide than a nano thumb drive.

It starts becoming a liability, though, when it's so archaic that the chance of misuse and hardware failure increases to the point that mission availability suffers.

You want a maximally secure nuclear weapon, but you also want it to still be able to turn a city into plasma. A secure ICBM that doesn't work is just an expensive hole in the ground.