Actually any tank holds value in a military setting especially by 2000-2001 - a standard WWII era Sherman tank doesnt have a hope in hell against a T-72 for instance -but against a homemade armored car, against troops that dont have anti-tank weapons (which remember have become pretty rare by 2001, especially in certain areas that didnt have a lot of them to begin with), against a BMP-C or BTR that has a non-operational gun system its more than sufficient
and keep in mind the situation in the US as per the canon -i.e. by 2000 the US military was putting anything that had a turret and an operational gun into its stocks as a tank - thus an old WWII Sherman would qualify as a tank to MilGov and CivGov
look at what just happened in the Ukraine - the rebels took an old Soviet tank from a museum, made it operational and used it in combat successfully against Ukranian troops who didnt have anti-armor weapons on them until the tank broke down and was captured by the Ukranian troops
and most US marauder groups dont have anit-tank weapons beyond a bottle of flaming gasoline - i.e. look at Alleghany Uprising - those kinds of weapons are not in the hands of the marauders - so a single old Sherman tank there would literally be something they couldnt handle unless they get to Molotov cocktail range
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