Link: https://www.darpa.mil/news-events/2015-04-27

The EXACTO program set out to develop custom 'smart' .50 BMG sniper ammunition and a custom optic, to be used with existing, unmodified .50 BMG sniper rifles.

In November of 2009, DARPA awarded Lockheed Martin $12.3 million and Teledyne Scientific & Imaging $9.5 million to begin work on the new weapon.

Army Captain Keith Bell, former commander of the Army sniper school at Fort Benning, Ga., can't wait to get his hands on the new rifle. "The EXACTO would be revolutionary," he says. "It will more than double our range and probably more than double our accuracy... There's no limit as far as I can see so long as the bullet's stable — I think 2,000 or 2,500 meters is very attainable," Bell says.

Source: TIME

Published April 2009

In 2015, a second round of live fire tests showcased the technology and DARPA uploaded video showing fired rounds adjusting their trajectory in mid-flight to hit moving targets.

DARPA’s Extreme Accuracy Tasked Ordnance (EXACTO) program, which developed a self-steering bullet to increase hit rates for difficult, long-distance shots, completed in February its most successful round of live-fire tests to date. An experienced shooter using the technology demonstration system repeatedly hit moving and evading targets. Additionally, a novice shooter using the system for the first time hit a moving target.

Source: DARPA

Published April 2015

Wikipedia page -
https://en.wikipedia.org/wiki/EXACTO