1. The Operator of the Ten 0 is technically a child soldier who was forcefully conscripted to fight in a cataclysmic war... He's technically still a soldier now, long after those who conscripted him have been wiped out. He's one of the ones who wiped them out after all.
2. IRL, conscription is a tool for the desperate. War, and fighting in a war should only be done by those who are fully informed of, aware of, and willing to face the rigors and consequences that come from war. An unwilling soldier is unfit for such a thing.