U.S. Defense Secretary Ash Carter arrives in Baghdad, Iraq to meet with his commanders and assess the progress in the opening days of the operation to retake the city of Mosul from Islamic State militants, on Saturday, Oct. 22, 2016. His visit comes two days after a U.S. service member was killed outside Mosul, underscoring the risk that American troops are taking as they advise Iraqi forces in the fight. (AP Photo/Lolita Baldor)
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