“There are two possibilities for such a withdrawal:
1. There is a change of STRATEGY and an abandonment of Syria, much like Obama abandoned Iraq. That would be an unmitigated disaster.
2. There is a change of TACTICS, made possible by the changing reality on the ground. The defeat of ISIS allows for a new approach with lessened American visibility to pursue a larger strategy in the Middle East, including the defeat of the Islamic Republic in Iran and the arrest of Islamism’s advance in Turkey. The withdrawal of a small amount of soldiers from the Syria/Turkish border in this context is not only necessary but advisable.”
Read the Daniel Greenfield article on it...best explanation I’ve seen to date.