LOL, nonsense read that post again, the Army and Marines were overwhelmingly made up of volunteers, as were the men who died fighting in Vietnam.
Even if what you say is true, and there is a lot out there contradicting it, you really think one could feel safe from that at the time? No way could anyone know for sure nor would I count on that supposed “all-volunteer” policy in making a decision to join or take a chance on being drafted. I volunteered when there was no draft and I knew what job I was getting and where. Getting straight 99’s on my ASVAB pretty much ensured that.