ORIGINAL: Sport_Pilot
ORIGINAL: DelRay
"There's nothing we can do".................Well, I would say a good start would be to sharpen up on marksmanship.
A good burst from an EMI gun might knock it out as well. Or just radio jamming of radio control / instruction and GMI. Not to mention guided missles.
Guided missles flying over out cities trying to intercept low flying autonomous RC airplanes? If we get to that point America will be a very different country then it is now. EMI guns are a good idear, but you'll need a lot of man power to keep an eye in the sky.