Aza Betwata (left) and his brother Mirwan (center) left Holland to join the Kurdish peshmerga fighting against ISIS militants in northern Iraq. Though the brothers come from a family of fighters, Aza had just two days of training — his brother must show him how to strip and clean his rifle. Alice Fordham/NPR hide caption

itoggle caption Alice Fordham/NPR

A family passes through Maktab Khaled in northern Iraq, the last Kurdish checkpoint before they make their way to Kirkuk. ISIS-controlled territory lies less than a mile away. Leila Fadel/NPR hide caption

itoggle caption Leila Fadel/NPR

Alleged Islamic State militants stand next to an ISIS flag atop a hill in the Syrian town of Ain al-Arab, called Kobane by the Kurds, as seen from the Turkish-Syrian border in Suruc, Turkey, on Monday. Aris Messinis/AFP/Getty Images hide caption

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"Today's anti-Westernism is a reaction to yesterday's racism," Iranian President Hassan Rouhani said in a speech at the U.N. General Assembly on Thursday. Jason DeCrow/AP hide caption

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Fighters from the Islamic State group parade in their northern Syrian stronghold, Raqqa. Uncredited/AP/Raqqa Media Center hide caption

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In this image made through a window of the Oval Office, President Obama speaks on the phone to Saudi Arabia's King Abdullah on Wednesday. Charles Dharapak/AP hide caption

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Staff Sgt. Daniel Leavindofske and Senior Airman David Babcock help load bundles of halal meals onto a cargo aircraft for a humanitarian mission over Iraq on Saturday. Staff Sgt. Vernon Young Jr./U.S. Air Force via Getty Images hide caption

itoggle caption Staff Sgt. Vernon Young Jr./U.S. Air Force via Getty Images

People walk on the rubble of the destroyed Mosque of the Prophet Yunus, or Jonah, in Mosul. The revered Muslim shrine was destroyed on Thursday by militants who overran the city in June and imposed their harsh interpretation of Islamic law. Uncredited/AP hide caption

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Iraqi Shiite volunteers with the Labayk ya Hussein Brigade take part in a training session in the holy city of Najaf in late June. Clerics in the city called for Shiites to step forward and fight the Sunni group formerly known as the Islamic State of Iraq and Syria (which now calls itself simply the Islamic State). Haidar Hamdan/AFP/Getty Images hide caption

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Iraqi members of the Emergency Response Brigade patrol streets in the western city of Ramadi in Anbar province, where government forces are fighting extremist militants, including a force from the Islamic State of Iraq and Syria. -/AFP/Getty Images hide caption

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Secretary of State John Kerry (second from left) arrives at Irbil International Airport with U.S. Ambassador to Iraq Robert Stephen Beecroft (fourth from left) on Tuesday. The president of Iraq's ethnic Kurdish region declared Tuesday that "we are facing a new reality and a new Iraq." Brendan Smialowski/AP hide caption

itoggle caption Brendan Smialowski/AP