I am not sure what you are trying to say. What cause and what effect? The military is not flooded with blue collar labor because it is hard to even get into the military without a high school education. Also far more young people do NOT enter the military, so why should they all be deprived of a non college oriented education that has a practical potential. When I was in high school, we had four education paths we could choose from—college scientific, college liberal arts, clerical, or trade/mechanical. Each path had a number of courses you could pick from to pursue a career/work path. Even though I was college liberal arts, I had regular phys ed, and also chose cooking, sewing, and home nursing classes. It was known as a good school system, but I am not aware that students today have nearly as many options. These days phys ed seems to be particularly absent and we have an enhanced obesity problem.