After going through military service, they will be a lot less failing and a lot less disgruntled. Plus, they could be kept there for a very long time and when t

After going through military service, they will be a lot less failing and a lot less disgruntled. Plus, they could be kept there for a very long time and when the military is very large, very experienced due to long service years, and is comprised of people with no positive life experiences and no positive expectations of civilian life - so after a short initial adaptation period, no longer longing to return to it - it can be used to do many beneficial things, such as building actual empires, squashing authoritarians worldwide, building contiguous, continent-wide spaces free for borderless trade and investment.