Vietnam is a war that was lost at home, not in the jungles of Vietnam. Most engagements the US were involved in, they won. The US won the battles, but the NVA won the war. It was simply unpopular because the American People viewed it as a revolution between the North and the South. The US government viewed it as a war of containment regarding communism; this is following the McCarthy era.

Honestly, bud. I would prefer US troops. You pick the fight, It is your RP. Do you want all of us in one squad (difficult) to manage and always seems to fail, or would you prefer we all take on different roles in very different organizations? That would hinder collaboration, but enable folks to employ much more creativity in their writing.