Space Delta 4

Space Delta 4 (DEL 4) is a United States Space Force unit responsible for providing strategic and theater missile warning to the United States and its international partners. It operates three constellations of Overhead Persistent Infrared (OPIR) satellites and two types of Ground-Based Radars (GBRs) for the purpose of conducting strategic and theater missile warning. Additionally, DEL 4 provides tipping and cueing to missile defense forces, battlespace awareness to combatant commanders and technical intelligence for further analysis and manages weapon system architectures and ensures operations are intelligence-led, cyber-resilient, and driven by innovation, while postured to operate in a contested, degraded, and operationally-limited environment.

Activated on 24 July 2020, the delta is headquartered at Buckley Space Force Base, Colorado.

History
DEL 4 was based on the previous 460th Operations Group, 460th Space Wing and 21st Operations Group, 21st Space Wing.

In lineage terms, the delta was originally established as 460 Operations Group (460 SW) on 2 August 2004. It was activated on 19 August 2004. It was redesignated as Space Delta 4 on 24 July 2020. Its status changed officially from a unit of the United States Air Force to a unit of the United States Space Force on 21 October 2020.

In 2023, Space Delta 4 assumed control of the U.S. Army's Joint Tactical Ground Station.