I think the fundamental question you need to ask yourself when considering the concept of bounties is the following: Was it actually a reality during the Vietnam War?

The truth of the matter is that there simply isn't much evidence supporting the existence of bounties beyond field reports and the testimonies of American soldiers. /u/Lich-Su answered this question the best way possible a few months ago and the conclusion that Lich-Su reaches is one that I fully agree with.