The US military does NOT operate on a just in time format.
It manages inventories. Current production may not be sufficient to meet immediate needs, but that is true about peacetime production at the beginning of all wars. And take that as you will.
https://en.wikipedia.org/wiki/Shell_Crisis_of_1915
And for that matter no Nato military that I know of does just in time.
You don’t know the bunch running this country. They spent their entire lives HATING the military...until they decided to send this country to war. That’s why I DESPISE them so much.