After watching from the sidelines, I have to go with Danzig.
Yes, a soldier must be willing to obey orders of all kinds, even when they might mean his death. Anything else would destroy the effectiveness of the military, which seems to be what Jager1 is basing his argument on. That's understandable. But ultimately, no soldier has a duty to obey any order that violates the Constitution. And the Iraq war does violate the Constitution. It was not declared by Congress, and Congress doesn't have the authority to delegate its powers to the president.
Danzig: You obviously became a soldier for the right reasons, and I respect that very much. I regret that your selflessness has been taken advantage of by the neocons who have hijacked the Republican party and whose goal is to spend US blood and treasure on Middle East wars for the sake of Israel.
By the way, before anyone automatically calls me an anti-Semite for that last statement, I should point out that I am technically Jewish myself (my mother was born Jewish but converted to Christianity). So if anyone needs to flame me, I believe the proper term to use in my case is "self-hating Jew."

But unlike many of the neocons,
this Jew is loyal to
America rather than to Israel.
Anyway, I was pretty certain even before the war started that it had nothing to do with WMDs (of which Israel has plenty) or "liberating" anyone. It wasn't about oil, either. It was about Israel. While most of my fellow Jews opposed the war, those who worked so hard to bring it about -- namely, Perle, Wolfowitz, Feith, Libby, Shulsky, Abrams, and all those guys -- were all extremely pro-Israel Jews and were essentially agents of a foreign power. Bush, Cheney, Rice, and some others were their willing puppets, possibly due to their "Christian Zionist" religious beliefs. The plan to invade Iraq existed well before 9/11, but 9/11 provided the "war fever" needed to sucker most of the US population into supporting an invasion of Iraq, even though Iraq had nothing to do with 9/11.
Well, now we see the mess we're in. Our borders are still wide open (how about putting some troops there?) and the world hates us more than ever. Probably the single best way to ensure a terrorist attack on one's own soil is to keep making enemies of people in the Middle East while refuse to seal one's borders. That's what this government of ours is doing.