Alternative point:
Conscription is not about fighting for your country. It's about ensuring that the children of the wealthy and powerful would die alongside the children of the poor in any conflict. War has always been fought by the poor and powerless to benefit the wealthy and powerful.
You then have a trained, but effectively civilian, group selected from the entire cross section of your country that shares the diversity of all your people and which you can use for all kinds of positive change, like building projects and disaster preparedness and relief.
This is a very different group than career soldiers.
This needs to be thought of as another two years of high school with different curricula rather than raising some kind of militia.