If a militia forms, it is to protect some piece of property, which is their territory. A multi-human entity holding a monopoly on violence over a defined territory is a government.

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It does not have to be a government. You want it to be. I do not. I do not agree with the premise that a temporary mutual aid agreement requires permanent authoritarian structures ruling over a particular place or group of people.
yes, indeed it is. but all property needs defenders or it decays. the plumbing won't maintain itself.