Military officials detailed to the House Armed Services Committee just how the troop rotation plan for Iraq will work. At the heart of the matter is how the military takes troops that are in contact with the enemy and replaces them with fresh forces. The troops leaving must give information to those replacing them so there is continuity of mission. Air Force Lt. Gen. Norton Schwartz, the director of operations with the Joint Staff, briefed the congressmen today. The current set-up in Iraq consists of four Army divisions and supporting forces -- the 82nd Airborne Division, the 1st Armored Division,...