Pre-nuclear wartime production.

[JHart]

US production would already be ramped up, assuming that production was increased to help the Chinese. Munitions such as small arms ammo, AT weapons, possibly arty ammo should be easy to produce. Trucks of all types could be shipped to China. Aircraft and tanks would take longer to build and ship and production of both may proceed in the assumption that if the Chinese hold on they will get tanks and planes, and if they don't, then the US and NATO may need them.

As an aside, I wonder if nations near China would provide material aide, especially if the US agrees to replace what ever is given. Japan could easily ship trucks and munitions, and Taiwan may side with the mainland and help. I thought they did in canon by i don't recall at the moment.