Lessons learned in Vietnam caused the development of four of the most successful jet fighters, all-aspect IR missiles, and active radar guided missiles. The US has lost ONE air to air engagement since Vietnam.
So, it wasn’t a total wash.
Except that 2 million or more Vietnamese civilians, some and maybe most innocent of wrongdoing got killed.
I too think the draft should disappear and be replaced with: Every 18-year-old male, or male high school graduate should upon reaching eligibility serve for 2 years of military service.
Which would be involuntary servitude which is unlawful in the USA except as punishment for a crime says the 13th amendment.
Even Barry Goldwater thought the draft was unconstitutional.
Without compulsory military service being allowed we could/would have stayed out of both world wars, the Korean war, and the Vietnam war and we would be trillions of dollars ahead.