U.S. military personnel with the 332nd Expeditionary Medical Group treat a trauma patient in the emergency room of the Air Force Theater Hospital on Balad Air Base, Iraq in this U.S. Air Force handout file photo from February 23, 2007. U.S. Army Lt. Col. Donald Robinson says the injuries caused by Iraq's dreaded improvised explosive devices are unlike anything seen in combat before, posing constant challenges for field surgery specialists in a conflict that has been dubbed the "Superbowl of Trauma." Picture taken February 23, 2007. To match feature IRAQ-USA/MEDICS