The draft is still legal and constitutional. If society and the constitution thinks it's acceptable to send 18 year old boys against their will to get machine-gunned in a foreign jungle in the name of "national security", then by those standards none of the measures being proposed to combat the coronavirus are an unprecendented or unacceptable violation of any so-called inalienable rights.

The virus poses a larger threat to national security than the Viet Cong, after all.