In this photo released on June 23, 2015, by a website of Islamic State militants, an Islamic State militant looks through the scope of his rifle in Kirkuk, northern Iraq. Though best known for its horrific brutalities — from its grotesque killings of captives to enslavement of women — the Islamic State group has proved to be a highly organized and flexible fighting force, according to senior Iraqi military and intelligence officials and Syrian Kurdish commanders on the front lines. (Militant website via AP)
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