"The US defence department, colloquially known as the pentagon, ran a wargame scenario a few years ago to see what will happen if US will be hit with a worst case scenario, years long semiconductor unavailability due to sabotage of domestic fabs, massive industry wide cyberattack, or something happening to Taiwan."

There is also the danger of counterfeit chips. It is already a plague for those of us hoping to get some good deals from Chinese vendors, but the US Navy as well was hit at least once with fakes.

https://www.justice.gov/sites/default/files/criminal-ccips/l... (.pdf document)