It hasn't crossed my mind for for our involvement in Iraq because it has been very short; I'm not sure there would have been time for the question of torture to even arise yet. But in longer conflicts (such as in the Pacific during WWII) where the bitterness gained a momentum of its own, I'm sure there have been cases where Americans used torture on the battlefield.
I believe there may be many opportunities for our troops and our intelligence organizations to face these tough questions in the future, so it's worth discussing now.
This is war, and it's going to leave many who fight in it with issues that weigh on their consciences. I'm just a realist. People who have to face those issues in defense of our freedoms have my gratitude. Think about our forces being asked to take fire from civilians now. They have to identify a positive target before returning fire. That's tough! If a troop fails to live up to that ideal, I'm on his side.