This dumbass apparently hasn't heard of Matthew Maupin, has he?
In my opinion some 2500 Americans were left in Vietnam. SOme were prisoners, others were missing in action and others were AWOL, or deserters.
Periodically a lone prisoner would be released in an Eastern Bloc capitol and silently wisked back to America.
Many strange stories and much intrigue. But one General I spoke with, one very familiar with all the players and information said that if he had any say--no young man should join the service because the government cannot honor its commitments to its service members in making certain every effort is made to account for its men.