I would think the lack of general care for soldiers after the fact is a big driving point of people just not wanting to even attempt it. Why put yourself through that rigorous experience if in 30 years you're disabled and fighting with your own government to help with living costs?
I don't delve too much into Military things so I can't even say for certain if I'm on track with this. This is purely from an outsider's perspective.
Big-hat Logan has Invaded your world.