In your opinion, the moral argument whether someone is conscripted under penalty of law to enter a war zone as cannon fodder is no different than whether someone volunteers for combat knowing full well the risks involved?
And you can easily join a non-combat division of the military so I don't even know what you're talking about in the last sentence. Even if joining to military to get on the GI Bill was your only option in life (impossible... but let's play out the hypothetical) you could sign up to be a cook on a boat or a myriad of other roles besides combat infantry.
I would say it is no different for the commander in chief or the commanders in the field who is making the decision to risk the lives of young men and women. You might argue that the act of volunteering removes the moral authority of the individual from the equasion, but I'd argue that there are reasons other than patriotism and willingness to risk one's life that compells them to join the military. Some (many or most, perhaps) do so much less out of a desire to serve than they do out of a nessessity -- escape a difficult life in an inner city, take care of family members, ticket to college. Heck, back in the day, judges used to compel young men to join the military or go to prison, for breaking laws.
I'm not sure why you think anybody has the ability to decide what they are going to be doing or where they are going to be doing it once he/she joins the military. A soldier is a soldier first, before they are a cook, a medic, or a barber, or a radio operator. The sailors who were cooks on the USS Cole were blown up just like the gunners. Who joins the military with a guarantee that they will not have to fight? The Department of Defense puts you where they need you -- they don't ask your opinion. For any indiividual member of the military, there is no such thing as a "non-combat" division, because virtually nobody goes to work at Fort Eustis in Newport News Virginia, or Naval Base San Diego, or Camp Pendleton California without the possibility of being in Afghanistan a month later with bullets flying.
A young man gives up his rights to make many decisions for himself when he signs on the dotted line. I have spent the last 27 years working for the Department of Defense, both on active duty and as a civilian, and your thoughts about how the military works makes ME wonder what YOU are talking about. W. sent thousands of young men and women to their deaths to fight a war that should never have happened. I don't want some jackass like him to have that kind of authority and control over my son. And most other people don't either. Indeed, the 1% who have little other choice are those that end up making the ultimate saccrifice. Those who have options will more than likely take them.
