You never heard of Agent Orange?

Can't say for sure I haven't heard the term before (can't claim I'm too young to know, more like old enough to start forgetting), but I did not know they had as a goal to remove whole forests, causing countless deaths by herbicide. The details are always more horrifying than I imagined.

That's interesting. Agent Orange and Napalm are two things I immediately associate with the Vietnam War. The countless severe birth defects caused by Agent Orange have been a big topic. (Well, at least outside the US...) In fact, they still happen today! https://en.wikipedia.org/wiki/Agent_Orange#Health_effects

If you want to sound old, say aloud “you’ve never heard of Muhammad Ali?”

And that's the scary thing: people aren't aware of the lessons of the past. Not the "past", even; Ali's draft refusal and Operation Ranch Hand were well within a human lifetime of now.