The military wants the simplest things possible. The only thing you could even reasonably want to have a way to disable would be crypto-related systems. For wea

The military wants the simplest things possible. The only thing you could even reasonably want to have a way to disable would be crypto-related systems. For weapons, heck, even nuke missile codes are set to 0000 or something similarly stupid, because in crunch time you don't want to have to look up the code for launching a nuclear missile that is already secured by several doors of thick steel. A missile with a way to disable it would be a nightmare, some dumb military officer or enlistee would routinely destroy them by pressing the wrong button, guaranteed.