Kurdish Peshmergas fight against Islamic State (IS) militants to regain the control of the town of Celavle in Diyala province, Iraq, on Aug. 24, 2014.

Yazidi refugees and local Kurdish youths take a break from the scorching temperatures and enjoy swimming and diving in the Euphrates River at Delal Bridge near Delal Refugee Camp, Iraq.

Yezidi children enjoy bank a muddy rivulet in Zakho district, a few kilometers from the Iraqi-Turkish border, Dohuk on Aug. 25, 2014.

Shi'ite volunteers, who have joined the Iraqi army to fight against militants of the Islamic State, formerly known as the Islamic State of Iraq and the Levant (ISIL), takes part in field training in Najaf, Iraq, Aug. 20, 2014.

A Kurdish fighter keeps guard while near Mosul in northern Iraq, Aug. 19, 2014. Sunni Muslim fighters led by the Islamic State swept through much of northern and western Iraq in June, capturing the Sunni cities of Tikrit and Mosul as well as the Mosul dam, which controls water and power supplies to millions of people down the Tigris river valley.

Shiite Muslim fighters from the Saraya al-Salam (Peace Brigades) brandish their weapons as they hold a position on the Jurf al-Sakhr front line against advancing Jihadist militants and fighters of the Islamic State (IS), south of the capital Baghdad, on August 18, 2014.

Thousands of Yazidis, trapped in the Sinjar mountains as they tried to escape from Islamic State (IS) forces, are rescued by Kurdish Peshmerga forces and Peoples Protection Unit (YPG) in Mosul, Iraq, Aug. 9, 2014.

Sgt. Lynn Morelly, 816th Expeditionary Airlift Squadron, C-17 Globemaster III loadmaster, watches bundles of halal meals parachute to the ground during a humanitarian airdrop mission over Iraq on Aug. 9, 2014.

Pallets of bottled water are loaded aboard a U.S. Air Force C-17 Globemaster III aircraft in preparation for a humanitarian airdrop over Iraq on August 8, 2014.

Staff Sgt. Daniel Leavindofske, 8th Expeditionary Air Mobility Squadron ramp team chief, and Senior Airman David Babcock, air transportation journeyman, assist with loading bundles of halal meals onto a C-17 Globemaster III for a humanitarian airdrop mission over Iraq on Aug. 9, 2014.

Thousands of Yazidi and Christian people flee Mosul, Iraq to Erbil after the latest wave of ISIL advances, Aug. 6, 2014.

Iraqi security forces and volunteers take part in a mission to secure an area from militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), in Udhaim district, north of Baghdad, Aug. 6, 2014.

Kurdish peshmergas patrol in Mahmur area to prevent attacks led by the Islamic State of Iraq and the Levant (ISIL) in Mosul, Iraq, Aug.6, 2014.

Members of the Kurdish Peshmerga forces take a position to fight against Islamic State of Iraq and the Levant (ISIL) in Mosul, Iraq, Aug. 5, 2014.

Smoke rises during clashes between Kurdish "peshmerga" troops and militants of the Islamic State, formerly known as the Islamic State in Iraq and the Levant (ISIL), on the outskirts of Sinjar, west of Mosul, Iraq, Aug. 5, 2014.

Kurdish peshmergas patrol the town of Rabia, previously seized by Islamic State of Iraq and the Levant, in Mosul, Iraq, Aug. 4,2014.

Iraqi men line up for physical examinations at an army recruiting center to volunteer for military service in Baghdad, Iraq, June 20, 2014.

Citizens fleeing from Tel Afar take shelter at a mosque in Sinjar, Iraq after Islamic State of Iraq and the Levan captured the Turkmen-majority city of Tel Afar, June 17, 2014.

An Iraqi boy holds a gun from the window of a vehicle carrying volunteers joining Iraqi security forces, June 16, 2014 in Baghdad.

Shiite tribal fighters raise their weapons and chant slogans against the al-Qaida-inspired Islamic State of Iraq and the Levant in Basra, Iraq, June 15, 2014.

Iraqi Kurdish Peshmerga fighters train in the grounds of their camp in Arbil, Iraq, June 14, 2014.

President Obama makes a statement regarding Iraq on June 13, 2014.

The Islamic State of Iraq and Syria (ISIS) has taken over much of the Iraqi province of Nineveh and the city, Mosul. Last year, they took control of Falluja.

Fighters of the Islamic State of Iraq and the Levant (ISIL) celebrate on vehicles taken from Iraqi security forces, at a street in city of Mosul, June 12, 2014. Black clad ISIL fighters have seized Iraq's second biggest city Mosul and Tikrit, as well as other towns and cities north of Baghdad.

An Iraqi soldier bodychecks men as they arrive to volunteer to join the fight against a major offensive by jihadists in northern Iraq on June 13, 2014, at recruiting center in the capital Baghdad.

Refugees fleeing from Mosul head to the self-ruled northern Kurdish region in Irbil, Iraq, June 12, 2014.

An Iraqi refugee girl from Mosul stands outside her family's tent at Khazir refugee camp outside Irbil, 217 miles (350 kilometers) north of Baghdad, Iraq, June 13, 2014.

Iraqi men chant slogans against the al-Qaida breakaway group Islamic State of Iraq and the Levant (ISIL), outside of the main army recruiting center to volunteer for military service in Baghdad, June. 12, 2014.

Iraqi men line up to be searched outside of the main army recruiting center to volunteer for military service in Baghdad, Iraq, June. 12, 2014, after authorities urged Iraqis to help battle insurgents.

Fighters of the Islamic State of Iraq and the Levant (ISIL) celebrate on vehicles taken from Iraqi security forces, at a street in city of Mosul, June 12, 2014.

Iraqi men who volunteered to join the fight against a major offensive by jihadists in northern Iraq stand on army trucks as they leave a recruiting center in the capital Baghdad on June 13, 2014.

Iraqi Shiite tribal leaders chant slogans against the al-Qaida-inspired Islamic State of Iraq and the Levant (ISIL), in Baghdad, Iraq, June. 13, 2014.

Fighters of the Islamic State of Iraq and the Levant (ISIL) stand guard at a checkpoint in the northern Iraq city of Mosul, June 11, 2014.