Military drones such as the U.S. Predator and Reaper have soared above battlefields for more than a decade. But small consumer drones that anyone can buy online have also begun to make their presence felt in modern battlefields. The militant group Islamic State has begun turning such small drones into flying bombs in their battles across Syria and Iraq.
Anything that can carry a payload and be remotely controlled (rules out kites, in other words). This should have been expected, I would hope.