Drones

Quadcopter drones are used to control mortar fire
http://www.youtube.com/watch?v=X8DPaoRtwh0

Is there any defense against that? I.e. you can't take drone with AK-47 and a rocket would be too expensive for a 200 bucks Chinese toy. Is now the time for fighter drones, taking one another?

I agree with poaster >>8-kun. Poaster >>7-sama does not realize what real-world sniping entails. In oarder to be cloase enough to be effective using an extant, light-weight optic system, the droan MUST fly loa and cloase enough soa that it will be at risk from snipers.