Luke its interesting you mentioned the SS and Lucas given his roots. I posted this on a different thread...
I found this on another board. Interesting post this guy made...
The mother of all sci fi movies. Really is about World War 2. The Empire / Rebel conflict parallels the Axis / Allies. The Millenium Falcon is just a B52, and Han a bomber pilot. Notice how the locales translate to the arenas the war was fought: the deserts of Africa, the forests of the Ardennes and Europe, and the tundra of Russia. We get tanks, squadron fighters, the bushido code of the Japanese, the polished techno-evil of the Nazis, the terrorizing, hypnotic power of Adolf Hitler (very similar-sounding to Darth Vader), and throughout, the mysticism of Judeo-Christianity, i.e. the plight of the chosen ones. Luke and Leia are Biblical / Semitic names. Of course, when I was 8, all I saw at the time was the greatest spectacle I ever experienced in a movie theater. It completely changed my life, and I understood what movies are supposed to be about. Lucas really did something special with this film. But the underlying text would make an interesting thesis though.
Jimbo Luke is right they have different voices and in fact in the original movie, which was originally intended to be the only movie and not episode IV, they were emotional, suprised, had different voices, etc. Don't give Lucas too much credit with this planned it all along crap.