Nope, all the way back to the beginning. The story spun out from George and Francis working on Apocalypse Now, George wanted to do a scifi version, the Rebels are the VC.
If the Rebels are Viet Cong who are the Chi-Coms and Soviets arming and funding them?
Nope... That may have been Lucas intent but you have to be an super duper psycho-babbler person to get any of that from watching a sci-fi movie. It wasn’t overt or clearly displayed. Sorry but it was just a movie. No one at that time seeing it were bemoaning the Vietnam connotations