Do you speak Arabic?
There's a LOT of songs synonymous with the 'Nam. "Fortunate Son" is probably my #1, but could be argued out of it by many of these:
"We gotta get out of this Place"
"For What it is Worth"
Edwin Star's "War"
"Paint it Black"
Country Joe and the Fish's "Vietnam Song"
"Hey Hey LBJ"
"Run Through the Jungle"
Something more modern, yet related, and tied to my personal wild time of the mid-80s...
[MEDIA=youtube]5NQtZI0Ecds[/MEDIA]
There are many more