Watch this video of the destruction of the Russian rescue helicopter. At 22 sec, you can see that one of the operators is wearing what appears to be an ISIS T-shirt.
22.Saniye T?örte Dikkat Rus Helikopterini Vuran Türkmen De?il I??D Ç?kt?
If they were ISIS affiliates, it does rather beg the question what they were doing with sophisticated US-supplied weapons.