U.S. Army soldiers take up a position during a patrol in Baghdad in 2007. The U.S. has been waging war nonstop for 15 years since the Sept. 11 attacks. Despite the protracted conflicts and disappointing results, U.S. involvement in multiple wars appears set to continue for years to come. Joe Raedle/Getty Images hide caption

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Abu Muhammed al-Adnani, spokesman for the Islamic State, has been killed in northern Syria, according to the IS semi-official news agency Amaq. He's shown here in an undated image provided by SITE Intel Group. AP hide caption

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This image released by the the Mass Graves Directorate of the Kurdish Regional Government shows a human jaw bone exhumed from a mass grave containing Yazidis killed by Islamic State militants in the Sinjar region of northern Iraq in 2015. Kurdish Mass Graves Directorate via AP hide caption

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People wait close to empty graves at a cemetery on Sunday, during the funeral for the victims of a suicide attack on a wedding party in Gaziantep, Turkey. At least 50 people were killed when a suspected suicide bomber linked to Islamic State jihadists attacked a wedding thronged with guests, officials say. Ilyas Akengin/AFP/Getty Images hide caption

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In images taken from CCTV issued by the Metropolitan Police in London, Kadiza Sultana, 16, (left), Shamima Begum, 15, (center) and Amira Abase, 15, (right) go through security at Gatwick airport in February 2015, before they caught their flight to Turkey. AP hide caption

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People mourn near a shopping center in Munich on July 23, the day after a shooting spree there left nine victims dead. The attack was one of several that month in Germany. Johannes Simon/Getty Images hide caption

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A member loyal to ISIS waves a flag in Raqqa, Syria, in 2014. Reuters hide caption

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Inside The Islamic State's Movement To Spread Terror 'All Over The World'

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Nicholas Rasmussen, director of the National Counterterrorism Center, says progress against the Islamic State may be slow to affect the terror attacks plaguing the West. Ariel Zambelich/NPR hide caption

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Counterterrorism Chief Sees Gains On The Battlefield, Stubborn Threats At Home

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People inspect a damaged mosque following an October 2015 explosion in Maiduguri, Nigeria. Maiduguri is in Borno State, where Boko Haram was born. Jossy Ola/AP hide caption

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A photo from 2011 shows buildings ravaged by fighting in Sirte, Libya. Islamic State militants have controlled the city since August 2015. The U.S. military has announced ongoing airstrikes against targets in Sirte. Manu Brabo/AP hide caption

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A French police officer stands guard by Saint-Etienne-du-Rouvray's city hall after a priest was killed and hostages taken at a church in the small town on Tuesday. Police say they killed two hostage-takers in the attack in the Normandy town, 77 miles north of Paris. Charly Triballeau/AFP/Getty Images hide caption

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An Afghan protester screams near the scene of a suicide attack that targeted crowds of minority Shiite Hazaras during a demonstration in Kabul on Saturday. Wakil Kohsar /AFP/Getty Images hide caption

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People gather at a makeshift memorial to honor the victims of an attack on Friday, near the area where a truck mowed through revelers in Nice, France. Laurent Cipriani/AP hide caption

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Family members and friends of the victims of the Istanbul attack paid tribute at a memorial service Thursday at Ataturk Airport. Turkish authorities say the evidence points to three Russian-speaking suicide bombers who were part of the Islamic State. Emrah Gurel/AP hide caption

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Iraqi firefighters and civilians evacuate bodies of victims killed from a bomb at a commercial area on Sunday in Karada neighborhood, Baghdad, Iraq. Khalid Mohammed/AP hide caption

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At Least 142 Killed In Islamic State-Claimed Bombing In Baghdad

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