As far as the military, is it too big a stretch to imagine an all volunteer military? I personally think conscription(the draft) of any sort is, indeed, unconstitutional.
Separate issue: doesn't matter whether the soldier/sailor/airman is a conscript or a volunteer. Ordering that person to die is a deprivation of the unalienable right to Life and therefore is not permitted.
I suppose if we had a volunteer army and a bunch of guys volunteered to charge into a hail of bullets, that would be okay.
"The white men were as thick and numerous and aimless as grasshoppers, moving always in a hurry but never seeming to get to whatever place it was they were going to." Dee Brown