"When I wrote it, Iraq (the U.S.-led war) didn't exist... but the parallels of what we did in Vietnam and Iraq are unbelievable."
The parallels of the US battling communist (Vietnam) and a tyrannical (Iraq) governments, and Luke Skywalker battling the Evil Empire are indeed unbelievable.
Uh..that IS what he meant, right?
If Lucas wants to discuss parallels, he should mention how much of his material was "borrowed" from Frank Herbert's Dune novels. The director who shot Herbert's movie was astonished by some 30+ instances of plagerism.