REDONDO BEACH, Calif. – March 15, 2022 – Built by Northrop Grumman Corporation (NYSE: NOC) in support of the Missile Defense Agency, two demonstration Space Tracking and Surveillance System (STSS) satellites successfully completed their missions and have been retired. Their achievements pave the way for future operational missile warning and tracking systems that will defend the nation.

“Launched in 2009 and expected to operate for four years, these demonstration satellites outlived their design life threshold three times over,” said Sarah Willoughby, vice president, overhead persistent infrared and geospatial systems, Northrop Grumman. “Now we are applying what we learned from STSS for future systems to keep America and its allies safe.”

The STSS experimental spacecraft proved their ability to detect and track short-, medium-, intermediate- and intercontinental-range missiles from boost phase to midcourse, then communicate target-quality track data to command and control systems for interception.

The satellites used sensors to detect and track ballistic missiles for interception. They tracked targets; helped discriminate real threats, guide interceptors to targets, and assess interceptor hits; collected data on launches, on-orbit satellites, satellite re-entries and other space-based missions; and played a critical role in one of MDA’s integrated Ballistic Missile Defense System flight test.

Northrop Grumman is a technology company, focused on global security and human discovery. Our pioneering solutions equip our customers with capabilities they need to connect, advance and protect the U.S. and its allies. Driven by a shared purpose to solve our customers’ toughest problems, our 90,000 employees define possible every day.