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TIKRIT, IRAQ - MARCH 31: Smoke trails over as Iraqi security forces and Shiite militas attack against Daesh (Islamic State of Iraq and the Levant) in Tikrit, Iraq on March 31, 2015. (Photo by Ali Mohammed/Anadolu Agency/Getty Images)

TIKRIT, IRAQ - MARCH 31: Smoke trails over as  Iraqi security forces and Shiite militas attack against Daesh (Islamic State of Iraq and the Levant) in Tikrit, Iraq on March 31, 2015. (Photo by Ali Mohammed/Anadolu Agency/Getty Images)