The Marines will join the approximately 500 U.S. troops already in Syria, such as these U.S. forces on the western outskirts of the northern Syrian city of Manbij on Sunday. Delil Souleiman /AFP/Getty Images hide caption

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Delil Souleiman /AFP/Getty Images

Burned, twisted metal from motorcycles covered an area where a suicide attacker blew up his small pickup truck outside a security office on Friday in the village of Sousian in northern Syria. AP hide caption

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AP

An airstrike targeting an Islamic State group cash and finance distribution center near Mosul, Iraq, as shown in a video released by the U.S. military. AP hide caption

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AP

New Report Finds ISIS Territorial Defeats Are Also Hitting The Group's Wallet

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Defense Secretary Jim Mattis seems to be aiming to reassure U.S. allies while overseas. Ahead of an unannounced visit to Iraq, Mattis rejected President Trump's statements that the U.S. should have seized Iraqi oil after the invasion. Susan Walsh/AP hide caption

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Susan Walsh/AP

Soldiers from the 36th Infantry Division deployed to Afghanistan to help train and advise that country's military. The top U.S. commander in Afghanistan says thousands more such troops are needed there. Maj. Randall Stillinger/U.S. Army hide caption

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Maj. Randall Stillinger/U.S. Army

A 2015 photo shows the Tetrapylon (Monumental Entrance), which was reconstructed after 1963 by the Directorate of Antiquities of Syria, in the ancient oasis city of Palmyra. The ancient structure has reportedly been destroyed by ISIS. Joseph Eid/AFP/Getty Images hide caption

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Joseph Eid/AFP/Getty Images

The Pentagon says many of the ISIS fighters targeted in Wednesday's strike escaped from the former ISIS stronghold of Sirte, shown here during fighting in September. Manu Brabo/AP hide caption

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Manu Brabo/AP

A man adjusts a victim's photograph displayed with floral tributes and Turkish flags outside the Reina nightclub following the attack in Istanbul earlier this month. Emrah Gurel/AP hide caption

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Emrah Gurel/AP

Flowers and pictures of victims have been laid in front of the Reina nightclub earlier this month after the deadly attack. Ozan Kose /AFP/Getty Images hide caption

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Ozan Kose /AFP/Getty Images

An F/A-18E Super Hornet is pictured in July on the flight deck of the aircraft carrier USS Dwight D. Eisenhower, which is deployed in support of Operation Inherent Resolve, which is targeting ISIS in Iraq and Syria. U.S. Navy/Getty hide caption

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U.S. Navy/Getty

Shiite worshippers gather for Arbaeen in Karbala on Nov. 20. Dozens of Shiite pilgrims were targeted for attack Thursday after the holiday, which marks the end of the 40-day mourning period after the anniversary of the 7th century martyrdom of Imam Hussein, the Prophet Muhammad's grandson. Karim Kadim/AP hide caption

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Karim Kadim/AP

Khalid Yaako Touma, a school teacher and deacon in the village of Karamlesh, collects religious books from one of the churches in the village that ISIS destroyed. Alice Fordham/NPR hide caption

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Alice Fordham/NPR

ISIS Is Gone, But Iraqi Christians Are Wary Of Returning Home

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U.S.-backed fighters rest during fighting with the Islamic State group near Ein Issa, north of Raqqa, Syria, as shown in a video by Qasioun, a Syrian opposition media outlet. AP hide caption

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AP

Displaced people stand on the back of a truck Tuesday at a checkpoint near Qayara, south of Mosul, Iraq, Felipe Dana/AP hide caption

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Felipe Dana/AP

Iraqi Forces Approach Outskirts Of ISIS-Held Mosul

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Iraq's elite counterterrorism forces advance toward Islamic State positions Tuesday in the village of Tob Zawa, about 5 miles from Mosul, Iraq. Khalid Mohammed/AP hide caption

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Khalid Mohammed/AP

A picture taken from the top of Mount Zardak, about 25 kilometers east of Mosul, shows smoke billowing in the Iraqi city of Nineveh during an operation against the Islamic State on Monday — part of a broad operation to retake the city from the Islamic State group. Safin Hamed/AFP/Getty Images hide caption

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Safin Hamed/AFP/Getty Images