Keep in mind also that you have all kinds of vehicles in private hands as well in the US - everything from Sherman tanks to Ferrets are in the hands of private collectors, many of which have live tubes and are fully functional.
Those vehicles definitely would be part of militia units, either official ones sanctioned by the States, or private ones in areas where the State governments had broken down.
As for display vehicles and other assorted items - I know for a fact that an old Sherman used in my area where I grew up as a VFW display had a live tube. The vets, many of whom served as tankers in WWII, kept her functional and on at least three occasions she was driven in parades as late as 1991 (Gulf War victory celebration). In a Twilight 2000 world she definitely would have been part of any local militia raised in that area.
As for the Army tracking them down - they will have more than enough to do going thru places like Anniston Army Depot, Fort Knox, etc.. looking for anything that can be repaired and put back into the fight to ever start grabbing display vehicles at VFW's or go rooting thru a National Guard bone yard in Idaho or North Dakota except possibly in hot zones like CA, AZ, or Alaska once they were invaded and they literally needed everything they could lay their hands on.
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