There are fewer countries under communism than anytime since 1946. If you want something serious to worry about other than the poor little boy and some Viets, there are 1.6 billion commies in China and North Korea. Those countries have nuclear weapons and missiles that can reach the US.
If you need to feel the Viet Nam war was worthwhile and honorable, knock yourself out. You really can block out history if you try hard enough. Good night!