@CoinOfNote@histodons@numismatics Your point is valid for those who were drafted and sent to Vietnam. Those who volunteer for the military at any time knowingly surrender their morals to those they are thus sworn to obey.
While it is true that, since the Nuremberg principles, soldiers are alleged to be able to refuse an immoral order, the likelihood of being shot should one chose to do so means the only sure way to not be forced to act against one's morals is not to enlist at all.