There's a Nam set game, it might be Guerilla's first game, where at one point you just mow down like thousands of Vietcong/NVA by the bucketloads. Then this dude gets hacked up by machetes for no reason plot wise but you need a reason to keep slaughtering them since every battle is basically entirely unfair.
I think I remember it because people would later talk about the deep storytelling of
Killzone. Which it was, about the struggle of a midget to defeat evil Space Nazi's.
Vietcong 2 has a "second quest" where you play as a like 17 year old Vietcong soldier. I was always kinda surprised that got no attention as I think it came out around the time everyone was throwing a fit over you playing as the Taliban in the MP of that one game. I don't think it's anything like the first Vietcong game either where like you could bleed out and die because you got shot by some VC you didn't see in the bushes and couldn't apply bandages in time.
NAM which is like a Duke Nukem 3D mod that got made into a retail game back when that was normal is about you basically are part of a new Captain America style project (to explain how you can get shot so much basically) only you gun everyone down with machine guns because why not, I noticed I have it on Steam the other day.
