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DARPA researchers have recently tested homing bullets that maneuver themselves in-flight to hit moving targets from long distance. Researchers first tested the Extreme Accuracy Tasked Ordnance (EXACTO) earlier this year, and expert, as well as novice, marksmen consistently hit a target from hundreds of yards away. 

An EXACTO homing bullet utilizes a real-time, optical guidance system to identify a target and keep it in its sights. It uses some sort of onboard mechanism to control its flight and correct course in the short time it’s airborne. The system, DARPA says, compensates for weather, wind, target movement and other factors with each shot.