"Video posted by the news agency showed jubilant Islamic State fighters parading in trucks sporting the New Syrian Army’s insignia and fawning over heavy weapons and ammunition belts apparently captured in the fighting. One militant is shown mutilating the corpse of a rebel fighter and cutting off the head. The New Syrian Army withdrew from the area, marking the latest setback for U.S. plans to train and equip Syrian rebels capable of battling Islamic State militants...“They did nothing,” he said. “They went to the border and came back. This was more a media show than anything else.”"