Just how did they get weaponized Drones? I know Iran captured one of our several years ago. They them built a copy or and improvement, depending upon who is writing the news article. Did Iran give them to ISIS or did they capture some Russian models? It is not that ISIS tech are dumb, but having to move around to keep from getting bombed makes it hard to build something like a weaponized drone.
It would be interesting to find out who gave them the technology.