The Biden administration has pledged to provide up to $6.6 billion so that a Taiwanese semiconductor giant can expand the facilities it is already building in Arizona and better ensure that the most-advanced microchips are produced domestically for the first time.
you can’t just decide to build cutting edge chips
if the DoD needed cutting edge chips but had to purchase them from within the US, all that would happen is their technology would be worse for the next decade(s) until US production could catch up
given the current us procurement strategy of keeping at least a generation or so ahead of its next near-peer, i really doubt that would fly