The US Army has a project they're calling " Autonomous Rotorcraft Sniper System" that's designed to kill just the person they're after. It's essentially a tiny

The US Army has a project they're calling " Autonomous Rotorcraft Sniper System" that's designed to kill just the person they're after. It's essentially a tiny remote controlled helicopter with high-precision sensors and a stabilized rifle. They started flying a prototype in 2009, but I can't tell from public sources if they ever got it to work.