Clearly representative of the Gulf of Tonkin incident.
Unwilling to give up fully on his anti-Vietnam sentiment just because he was doing a movie about spacemen fighting with laser swords, Lucas modeled Star Wars' central conflict around what he saw as the realities of Vietnam -- namely, "a large technological empire going after a small group of freedom fighters." Yep, he basically saw the Empire as a stand-in for America, while the rebellion was just the inevitable result of the overextension of its powers. So Princess Leia was ... Ho Chi Minh, we guess?
All of this subversive anti-Vietnam sentiment culminated in what's considered the most childish movie of the original trilogy, Return Of The Jedi. The film features a small group of technologically inferior, vegetation-dwelling guerrilla fighters who manage to defeat an empire against the odds. Yes, the Ewoks are a stand-in for the Viet Cong.
Lucasfilm, US Army