It was a tracked robot, which might be the best thing to call it to avoid confusion. But armed drones are coming:
It's hard to see in this image but this drone is armed with a full-auto gun.
You’re right. I was using drone in a loose way but the definition of drone is an aircraft or ship. But in the big picture an automated device was used purposely to kill a suspect. Shakey ground and ripe for slippery slope.
FPS Russia’s “armed drone” was CGI. It was a promotional for Call of Duty.