Do we need any stinkin tanks? We have tanks and an armoured corps because of our European/counter-Russian focused defence policy. Even with a shift toward the Pacific, ain't no one envisioning us fighting a land battle with tanks against China.
So, if the reasons we have our tanks is to one day be used against Russia, then let's send them all to Ukraine and have them fight Russians. Woe be to our zipper heads, yes, but if there's anything this conflict has shown is that we'll never actually send out own personnel to fight Russia unless Russia attacks NATO, and I'd say chances of that are low.