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BAGHOUZ, SYRIA - MARCH 23: Syrian Democratic Forces (SDF) fighters pose for a photo with the American flag on stage after a SDF victory ceremony announcing the defeat of ISIL in Baghouz was held at Omer Oil Field on March 23, 2019 in Baghouz, Syria. The Kurdish-led and American-backed Syrian Defense Forces (SDF) declared on Saturday the "100% territorial defeat" of the so-called Islamic State, also known as ISIS or ISIL. The group once controlled vast areas across Syria and Iraq and a population of up to 12 million, an aspired "caliphate" that drew tens of thousands of foreign nationals to join its ranks. (Photo by Chris McGrath/Getty Images)

BAGHOUZ, SYRIA - MARCH 23: Syrian Democratic Forces (SDF) fighters pose for a photo with the American flag on stage after a SDF victory ceremony announcing the defeat of ISIL in Baghouz was held at Omer Oil Field on March 23, 2019 in Baghouz, Syria. The Kurdish-led and American-backed Syrian Defense Forces (SDF) declared on Saturday the "100% territorial defeat" of the so-called Islamic State, also known as ISIS or ISIL. The group once controlled vast areas across Syria and Iraq and a population of up to 12 million, an aspired "caliphate" that drew tens of thousands of foreign nationals to join its ranks. (Photo by Chris McGrath/Getty Images)