People are against the draft, since our government caused the needless deaths of 58,000 of our men in Vietnam. Draftee death rates were 2x as high as volunteers.
People have a pretty good handle on when our country is in a legitimate war, and when its not. Thats why there was such an influx of volunteers after 9-11. And thats why the army is struggling for recruits right now.
Plus, we all have our roles in society. Some are warriors, others workers, others intellectuals. If a mandatory government service allowed people a WIDE range of jobs (military/human services/wildlife conservation/etc), I would be for it. But forcing everyone to join the military? Nah, America is built on freedom, not forced conscription. Let me contribute in my own way.