U.S.-backed Syrian Democratic Forces, made up of an alliance of Arab and Kurdish fighters, regroup on the northern outskirts of Deir Ezzor as they advance to encircle the ISIS bastion of Raqqa on Feb. 21. Delil Souleiman/AFP/Getty Images hide caption

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Delil Souleiman/AFP/Getty Images

Big Changes And Major Dilemmas Loom In Next Phase of ISIS War in Syria

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