You said 20% which would be a little more then 200000. The current military is roughly 1.4 million people. I have no blind spot in how much repair things need but you have a blindspot in the actual technical training required to repair. Most jobs are hyper focused and dummy proof. You are saying over 200000 military people are highly skilled and trained in high tech which is simply not true. Majority is grunt work any yockle could do. There is a reason they have been lowering the education levels required, it's because you just don't need a lot of brain power to follow orders and perform basic tasks repetivly