These are U.S.-backed Syrian rebels.
This flag belongs to another U.S.-backed group, the Syrian Democratic Forces.
They're fighting each other in northern Syria.
This shows how much of a mess Syria's front lines are right now.
Turkey's backing the Syrian rebels, too. It helped them seize the ISIS border town of Jarabulus.
SEE MORE: How Many ISIS Fighters Are There? It's Hard To Tell
The rebels almost immediately clashed with the U.S.-backed SDF just south of Jarabulus.
The SDF had recently liberated the important city of Manbij from ISIS.
So, while ISIS is their enemy … the SDF and rebels are each other's enemy, too.
The U.S. is on the fence. As a NATO ally, it supports Turkey, which supports the rebel groups. But the U.S. also supports the SDF, which has been enormously successful fighting ISIS.
