You probably would have pockets here and there that would have higher tech still operating. Perhaps a town that was hooked up to hydroelectric power and thus never lost its lights combined with a local medium size machine shop that could make spare parts for vehicles and machines and thus keep a tech level of the 1950's or so going. Keep in mind that most of the big cities werent hit by nukes - Boston for instance was untouched.
And at least some of the army divisions, from statements made in various modules would have surivived to be post war powers - i.e. like the 49th Armored Division down in Texas. They might be vastly smaller but given your scenario think how powerful a remnant Roman Legion would have been in Europe after the Roman Empire fell - here you would have a hard core of middle aged vets who fought in the war training their 12-16 year old kids in the art of war - and most likely they would be very well armed by 2017 civilian standards even if only a few of their vehicles, mortars and artillery pieces were still working.
If everyone else is down to rifles and pistols even a single operable artillery piece with a limited supply of amount of ammo can be a game changer as to who has the power and who doesnt.
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