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An Iraqi fighter from the Shiite popular mobilisation unit arranges a bullet belt in the outskirts of Baiji refinery north of Tikrit, in the Salahaddin province, during a joint operation with the Iraqi army to retake the remaining area of the oil refinery from Islamic State (IS) group jihadists, on May 25, 2015. Iraq rejected accusations by the US defence chief that its security forces dodged battle in Ramadi and lack the will to fight the IS group. AFP PHOTO / AHMAD AL-RUBAYE (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)

An Iraqi fighter from the Shiite popular mobilisation unit arranges a bullet belt in the outskirts of Baiji refinery north of Tikrit, in the Salahaddin province, during a joint operation with the Iraqi army to retake the remaining area of the oil refinery from Islamic State (IS) group jihadists, on May 25, 2015. Iraq rejected accusations by the US defence chief that its security forces dodged battle in Ramadi and lack the will to fight the IS group. AFP PHOTO / AHMAD AL-RUBAYE        (Photo credit should read AHMAD AL-RUBAYE/AFP/Getty Images)