On 16 January 2019 , a suicide bombing claimed by ISIL in the SDF-controlled town of Manbij killed four U.S. personnel and injured three servicemen , making it the deadliest attack on Coalition forces in the country since the intervention . The ISIL attack drew a second round of criticism of the U.S. president 's withdrawal order , with critics linking the attack with an emboldening of ISIL terror and insurgent tactics due to the announcement of a U.S. pullout , despite the group 's continued loss of territory in Syria . President Trump offered condolences to the families of the slain American citizens on 17 January while he reaffirmed his policy of withdrawing troops . Trump paid tribute to the fallen Americans during a trip to Dover Air Force Base in the U.S. state of Delaware on 19 January , where their remains were received
suicide bombing
2019 Manbij bombing
American-led intervention in the Syrian Civil War