One thing to keep in mind as to ramp ups of production - things like castings, tank guns, engines, transmissions have long lead times - in some cases up to a year
So even assuming that the US ramped up tank and AFV production with the start of the Russian Chinese war it would take nearly a year to get all those lines up to capacity for new production.
Now reman and reset are different - those could be expanded more quickly in some cases - but you dont just suddenly get another 1000 tank engines
its the same with ship production - you can accelerate new ships already in the pipeline that at the least have been laid down and all major parts in hand but unless you were in series production and ordered long lead items years before you cant suddenly rush out a dozen new DD's or submarines from scratch
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