DARPA’s EXACTO program successfully tested a .50 cal bullet that can change its course in mid-flight to hit a target.
The bullet can hit its intended target despite high winds, minimal visibility, or sniper experience. According to DARPA, the system works by combining a maneuverable bullet and a real-time guidance system to track and deliver the projectile to the target, allowing the bullet to change path during flight to compensate for any unexpected factors that may drive it off course.
In this video, a sniper rifle is intentionally aimed off target to demonstrate the ability of the EXACTO system. At 0:22, notice how it does more than a minor correction to hit the target.