SNL's dart-like, self-guided bullet is four inches long and also uses an optical sensor in its nose to detect a laser guidance system that must remain on target for the bullet to track.
The EXACTO technology is now in phase II of development, which includes the design, integration and demonstration of aero-actuation controls, power sources, optical guidance systems, and sensors. The program's next phase includes a system-level live-fire test and technology refinement to enhance and improve performance.
"For military snipers, acquiring moving targets in unfavorable conditions, such as high winds and dusty terrain commonly found in Afghanistan, is extremely challenging with current technology," DARPA said on its website. "It is critical that snipers be able to engage targets faster, and with better accuracy, since any shot that doesn't hit a target also risks the safety of troops by indicating their presence and potentially exposing their location."
EXACTO Demonstrates First-Ever Guided .50-Caliber Bullets (Source: DARPA).