I see nothing wrong with it. It would be similar to the Selective Service Act of 1948. That bill allowed young men to join one of the services for a period or one year and serve either four years in the active reserve, or six years in the inactive reserve.I joined, along with thousands of other 18 year old men and served my four years in the active reserve. I was none the worse for wear because of it.
I would also favor young women being included, and those who are CO's should serve in non-combatant roles.
If one is going to enjoy the freedoms offered by this country, one should not object to defending them, either in a combat or non-combatant role. There are those, I know who are comfortable with others doing the defencing for them. It will be always thus, I suppose.
That's my opionion anyway.
DougR