I think this is a common, but incorrect assumption. What military commanders want (and what CEOs want, and what users want), is control and assistance. They don't want a system that can't be turned off if it means losing control.
It's a mistake to assume that people want an immortal force. I haven't met anyone who wants that (okay, that's decidedly anecdotal), and I haven't seen anyone online say, "We want an all-powerful, immortal system that we cannot control." Who are the people asking for this?
> ... it will do whatever it can to prevent it being turned off.
This statement pre-supposes that there's an existing sense of self-will or self-preservation in the systems. Beyond LLMs creating scary-looking text, I don't see evidence that current systems have any sense of will or a survival instinct.