"France admits soldiers have deserted to ISIS, including ex-elite special forces and French foreign legionnaires" http://news.nationalpost.com/news/france-admits-soldiers-hav... But that said black jumper doesn't mean a soldier ISIS likes their blacks (too early for humor but the latest South Park episode kinda dealt exactly with that), could be a professional soldier, could just be an experienced fighter, could be just a guy who spent 2 weeks in Libya training how to fire an AK that looked scary and professional because he had a gun and a black adult onesie. Eye witness testimonies are often inaccurate even if they had sufficient experience to judge the expertise of the attacker they would likely over estimate it due to the trauma.