The U.S. military has about 2,000 U.S. troops in Syria across a number of bases, mostly in the northeast. The troops are working with local forces to prevent a resurgence of Islamic State, which in 2014 seized large swathes of Iraq and Syria but was later pushed back.

The end of the Assad era has reduced some threats, but the Islamic State has shown renewed strength in the country.

The U.S. will withdraw about 600 troops from Syria, leaving fewer than 1,000 to work with Kurdish allies to counter the Islamic State group.