U.S. Military Mission In Syria Endures As ISIS Nears Defeat

The Kurdish soldiers stand watch at this rustic outpost, nothing more than sand bags and hardened earth, like some sort of prehistoric fortress. Some of the fighters carry AK-47s, others hold machine guns. And all are looking to the south and the front line with ISIS in northeast Syria.

It's a vast open plain.

Gen. Hassan commands these troops. He's a short, squat man with salt-and-pepper hair, and he points out in the distance where the enemy is located, just a couple of mud huts on the horizon.

"That place. That village farm is the place for ISIS," says Hassan. "A couple of kilometers. After this there are many villages controlled by ISIS."

Hassan knows that at some point his troops will have to leave their base and take on ISIS.

But that may have to wait. Because right now some of his fighters are leaving, heading to the northwest part of Syria to a place called Afrin.

The Turkish army is battling their Kurdish comrades there. Why? Because