https://www.msn.com/en-us/news/tech...70a2-to-the-united-army/ar-AAZuUVe?li=BBnbfcs I used to teach school at Camden. And discipline was far, far better there than a nearby comparable school. Why? I heard more than once a student warn another one that "If you get written up again you might not get to go to Lockheed Martin!!" Lockheed Martin conducted several tours of their huge plant there every year which were immensely popular in addition to the college scholarships they offered.
https://www.quora.com/How-ridiculous-was-American-production-in-World-War-2 "It is honestly hard to fully grasp the magnitude of the industrial might that was leveraged during the conflict. But hopefully this has given you some appreciation for the monumental effort put forth by American industry and the American people."
We did this with a population of just 132 million, and after some 20 years of immigration restriction. Compare that with now, a population of some 340 million and can't find enough people who can do 10 push ups or pass 6th grade to get in the military with a much smaller troop level.