Tha vast majority of military chip requirements can be met with old processes. You don't need a 5nm chip with a 13 billion transistors in a F-35 or for the guidance module in a cruise missile.

Very modern chips are more suited for intelligence work no weapons systems per se. The physics of flight, artillery and balistic missiles is pretty much well understood, we don't need machine learning for that. Some modern systems use computer vision as a terminal guidance system, but again, you don't need state of art semis for that.