When it Comes to Seoul’s New Missile Sensors, Pyongyang is Out of Luck North Korea has no answer for the enhanced the Joint Tactical Ground Station (JTAGS) capabilities in South Korea. Here's What You Need to Remember: "JTAGS is vital to warfighters and of growing importance as we create true Joint All-Domain Command and Control systems, especially as we find new ways to integrate and leverage space-based assets.” Defense contractor Northrop Grumman and the U.S. Army have enhanced the Joint Tactical Ground Station (JTAGS) capabilities in South Korea. The deployment of the JTAGS system will improve battle-space awareness and improve missile defense. This has marked the completion of phase one of the platform's modernization efforts.