They still have American training, American weapons, American air support, American intelligence information, American money as monthly salary, American orders when to stop attacking the Regime & when to make truce with them (like in Aleppo City), American orders when to advance against the Islamic State after their airplanes & drones make sure the area is clear.

And the US soldiers entered ar-Rai without a problem, meaning they were let in by those in charge & they leaved without a problem.