Then how was it that the draft was in place until the early '70's.....with your attitude of Just don't volunteer me or my kids. is typical of my old tag line..."Americans are so spoiled with freedom they have no idea what it took to get it or what it takes to maintain it" Frankly your attitude is a slap in the face to all who serve or have served!!
That's a good question. But since involutary service in the military for purposes of combat in a time of war is based on historical precedent and since it was not specifically and separately prohibited in the 13th amendment, then it could be interpreted as not being intended to be included in the 13th amendment.
OTOH, there is no historical precedent for any kind of "national service". This is a modern socialistic idea with no historical foundation. Therefore it is exactly the kind of "involuntary servitude" that the 13th amendment was intended to prohibit. Drafting men to protect the nation in a time of war is one thing. Forcing people to perform community service in peacetime is another thing entirely (except as a punishment for a crime).
Oh, gosh I didn't see that little dig until after I'd politely answered your question.
I take it then that you are in favor of drafting people to force them into such service organizations as "Habitat for Humanity" or "the Peace corps" or "Greenpeace" and that anyone who opposes such mandatory enslavement to the cause of political correctness is somehow "slapping the face of the military?"
Take a hike!