"We've seen big, bulky Anti-UAV Defense Systems radio-jamming drones out of the sky before, but it looks like the Army also has a much smaller version on its hands. At this year's Association of the United States Army Annual Meeting and Exposition (AUSA 2015), the Army Cyber Institute at West Point was demoing a rifle-sized device that can do the same thing.
Here it is taking out a quadcopter."