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An Iraqi army soldier smokes a cigarette as toxic fumes rise on the horizon in Qayyarah, about 31 miles (50 km) south of Mosul, Iraq, Sunday, Oct. 23, 2016. Islamic State fighters torched a sulfur plant south of Mosul, sending a cloud of toxic fumes into the air that mingled with oil wells the militants had lit on fire to create a smoke screen. (AP Photo/Marko Drobnjakovic)

Iraq War

President Obama announced on Oct. 21 that the United States is pulling all its troop from Iraq by the end of the year. (ABC News)