In my opinion, this is a misrepresentation of the Vietnam war. The country was not "bombed back into the stone age". The U.S. merely used extremely despicable tactics like Agent Orange, My Lai etc.

I'm also not aware of the existing Vietnamese government falling (depends on which one you consider the existing one but it was not the government the U.S. wanted to fall that fell). The country resisted a superior invader like it did in the past (China) and I'm pretty sure most people would consider Vietnam the winner of the war (if there's a winner in war).