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Syrian People's Protection Units (YPG) member in frontline of Raqqa fights against Daesh, on January 2, 2016. (Photo by Jacob Simkin/NurPhoto via Getty Images)

Syrian People's Protection Units (YPG) member in frontline of Raqqa fights against Daesh, on January 2, 2016. (Photo by Jacob Simkin/NurPhoto via Getty Images)