U.S. Said to Find Iraq Nerve Agent Traces By LOUIS MEIXLER, Associated Press Writer BAIJI, Iraq - U.S. troops found about a dozen 55-gallon drums in an open field near this northern Iraqi town, and initial tests indicated one of them contained a mixture of a nerve agent and mustard gas, an American officer said Sunday. Lt. Col. Ted Martin of the 10th Cavalry Regiment said troops went to the site at midnight Friday after having been alerted by U.S. Special Forces teams, which were suspicious because of the presence of surface-to-air missiles guarding the area. A chemical team checked...