ISIS's drone, by contrast, is no armed sentinel. A military spokesman said it was "a small, unarmed hand-held type of the sort that can be purchased commercially," and that it could be used for battlefield surveillance. That includes basically any quadcopter or remote-control plane with a camera that can stream video to another device. Hand-held drones are great for troops fighting on the ground, because they give them a safe way to look over the next hill or around the corner without sticking their neck out. The RQ-11 Raven is a hand-tossed scout used by America's military for that exact purpose, and the Army has thousands of them.