Believing in a "well regulated militia" and all that it means, I think we should have Universal Military TRAINING, but not mandatory service. I think learning to master any skill in the military makes you a better person and the military has a lot of occupational specialties that directly transfer to civilian work. I consider it a part of a good education and a benefit to citizenship. However forcing people to serve is slavery IMO.
I have yet to meet a man in the military or prior service who deployed to combat who thinks that someone without a combat deployment and combat experience (actually being shot at and leading men in battle, etc.) has the right to send troops to a fight and quite possibly their deaths.
I am one. I do believe the decision to go to war is made more gravely by a man who knows more than just the dollar cost, but having served in war and in peace, I know that the military took on a whole new outlook for me after having served in Iraq. Before it was four years I'd spend playing with guns and getting to do fun things (and yes- truly miserable things that I still remember fondly). After the war and the older I get the more I realize what the military is about and why Clinton was so wrong to start messing with it, but then- Bush got dirty magazines banned from the PX, so social engineering occurs on both sides.
Lincoln had been a militia officer with Artillery. Eisenhower didn't so much command as he appointed officers who had and he ran the political game- also very important as he was a career Army officer with a lot of staff experience.
FDR knew what outcome he wanted clearly and made it known in general by not asking for an "authorization for the use of force" against Japan but for a
Declaration of War. I am happy I served and have advised others that if you have that little voice pushing you that direction then enlist because that voice will never go away and once you pass 35 or so, the voice becomes regret and by having a regret that you didn't serve, you'll value your manhood less. However- there are many, many hundreds of thousands of Americans for whom military service never will cross their minds, and that's OK as well. Somebody has to pay for the soldier's salary, food and housing.
There's no dishonor in not serving, there's only your personal feelings to consider and if you really think it will make you a better person, it probably will. If you are ever forced to do it against your will, it won't do anything but waste a couple years of your life. Like anything else, you get out of it what you put into it and those drafted tend to not put a lot into it.