Vietnam was really ugly. Women and children were acting as suicide bombers and it was an unpopular war, so we did one-year tours and most people going were about 19 years old (compared to mid twenties for average soldier age in WWII) and you are most likely to die in your first battle. If you survive your first battle, your odds of surviving the war go up.
So there were a lot of people seeing their first battle at a young age and it was a meat grinder. It was ugly even for a war.