CBS News"Enemy fire" kills US troop in northern IraqCBS NewsLast Updated May 3, 2016 7:39 AM EDT. U.S. Secretary of Defense Ash Carter said Tuesday that an American service member had been killed in Iraq, as the U.S. military stepped up its role helping Christian and Kurdish militias battling ISIS near the ...US Serviceman Killed in Combat by ISIS Forces in Northern IraqABC NewsAmerican Serviceman Dies in Iraq Near IrbilNBCNews.comDefense Secretary: US serviceman killed in IraqUSA TODAYFox News -The Hill -U.S.