"Good Morning Vietnam" movie with theme song "What a Wonderful World"

The War Remnants Museum. Welcome here if you want your mind to be tormented and your stomach churned. View the grisly exhibits depicting the horrors and carnage of war. They bring back my memories watching the TV in the late 1960s and early 1970s showing images of war planes spraying napalm bombs and defoliant known commonly as "agent orange". I vividly recall the lyrics of John Lennon songs which include "Imagine", "Give Peace a Chance" and "Happy Xmas (War is Over)".
"Imagine there is no countries. It isn't hard to do. Nothing to kill or die for. And no religion too! Imagine all the people. Living life in peace".........
The lyrics are soulfully and hauntingly true but the world is still not living in peace today.