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There was a time when medium tanks were actually made to be medium tanks but that era is over. Since then the term "medium tank" has become a proper synonym to be used in the place of saying "old tank."I think another problem we're starting to see is relying on foreign nations for things that we don't manufacture for ourselves. The 105 ammunition being the most obvious example but think about the train wreck it would be if Taiwan suddenly wasn't supplying computer chips.
Now we see Germany and Switzerland throwing a wrench into the works.
And is there a reason we don't have medium tanks anymore? (Not to hijack my own thread)
The Leopard 1, Challenger 1, even the US M1 Abrams before the turret was lengthened, and all Soviet era tanks which remain are now "medium tanks."
The exception to that rule is the odd ball Ukrainian T-84 post Soviet. Since it's new (still in production sort of), and has a big gun it's usually called a main battle tank to be nice, but if it didn't have that somewhat oversize gun, had instead a 105mm gun, it would be a true old style medium tank. It's unusually light, fast, and maneuverable.
Alas if there only were more than 10 of them, 4 of those which the US bought to bail out the Ukrainian government when they over extended in trying to build 10 of them for themselves.