 Complete the following phrase:  In early 2015, the group won a major victory over the Islamic State of Iraq and the Levant ISIL during the siege of Kobanî, where the YPG began to receive air and ground support from the United States and other Combined Joint Task Force  Operation Inherent Resolve militaries. Since then, the YPG has primarily fought against ISIL, as well as on occasion fighting other Syrian rebel groups and the Turkish Armed Forces. In late 2015, the YPG became part of the SDF, an umbrella group intended to better incorporate Arabs and minorities into the war effort. In 20162017, the SDFs 