You could probably go all the way down to a company forming a town or village's garrison, as it would be sort of merged with the town militia. Note this would be a T2k-strength company, say 50-60 soldiers and half again as many camp followers/support personnel. The regulars would be doing most of the out-of-town patrolling, and leaving in-town law enforcement to the police/militia.
Some centrally-located towns would have HQ and artillery elements, all the way up to brigade and division level.
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My Twilight claim to fame: I ran "Allegheny Uprising" at Allegheny College, spring of 1988.
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