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

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Iraqi Prime Minister Nouri al-Maliki (right) sits with Secretary of State John Kerry on Monday. Kerry was in Baghdad to push for Iraqi unity and stability, as Sunni militants swept through western towns abandoned by security forces. Brendan Smialowski/AFP/Getty Images hide caption

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President Obama speaks about Iraq in the Brady Briefing room of the White House Thursday. Obama said the U.S. will send up to 300 military advisers to Iraq — but that U.S. forces won't engage in combat with Islamic State in Iraq and Syria (ISIS) militants. Win McNamee/Getty Images hide caption

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Iraqi army soldiers parade during a recruiting drive for men to volunteer for military service in Baghdad on Thursday. The country's leaders are urging Iraqis to help battle insurgents who have mounted an aggressive campaign in the north. Karim Kadim/AP hide caption

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Displaced Iraqi children line up with their mothers Tuesday to register at a temporary camp for people fleeing violence in northern Iraq. Karim Sahib/AFP/Getty Images hide caption

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Peshmerga military direct traffic at a Kurdish Check point on Saturday in Kalak, Iraq. Thousands of people have fled Iraq's second city of Mosul after it was overrun by ISIS (Islamic State of Iraq and Syria) militants. Dan Kitwood/Getty Images hide caption

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A cellphone photo shows an armored vehicle belonging to Iraqi security forces in flames Tuesday, after hundreds of militants launched a major assault in Mosul. Some 500,000 Iraqis have fled their homes in the large city since militants took control. AFP/Getty Images hide caption

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