RAQQA, SYRIA - AUGUST 18: Smoke rises from a building believed to be housing ISIS, after being hit by a mortar round fired from a United States military base on August 18, 2017 in western Raqqa.The MFS is a group of Assyrian Christians who fight alongside the Syrian Democratic Forces (SDF) in Raqqa. The SDF was created in 2015 with the specific purpose of fighting ISIL and was armed by former US President Obama. The second Battle of Raqqa was launched in June 2017 and is the fifth and final phase of the Raqqa Campaign by the SDF. (Photo by Rick Findler/Getty Images)
