Your replies again tell me you have no concept of what a national system to support the warfighter includes and how it has to work 24/7/365 and the complexities of getting vital data from sensors to cockpits (as one of many examples). It cant ever go down, be out of service, and must supply products that you cant get through COTS. It has to be robust to all sorts of attack and it has to be secure from hacking. You can wish for something that ain’t if you want, but the reality remains.
Unfortunately you appear have no knowledge of distributed sensing, distributed processing, and distributed comms. Cyber security for distributed systems also has decades of theory behind it. Your mentality is antiquated and that is unfortunate.