I mean, we do "draft them" already, but we start at 4 years old and it turns out that a lot of what we're trying to teach them is actually the reason why they're struggling in life. More of that same paternalism probably isn't the solution.
I don't see mandatory national service being the answer for any of the parties involved. International militaries are moving towards drones, mechanization and AI...a bucket load of expensive to feed, cloth, house and pay 18 yr old privates with rifles marching up and down the square is long dead and gone. Being held back 2 years from education is the best way to take a cohort already losing to women in educational outcome and put them even further back and now our frustrated young men will be further behind, but in better shape and better with weapons.
Hard pass.
Fuck, spend the same money and just make college/university free.