Space Delta 4 (DEL 4) is a

United States Space Force The United States Space Force (USSF) is the Space force, space service branch of the United States Armed Forces, U.S. Armed Forces, one of the eight Uniformed services of the United States, U.S. uniformed services, and the world's only inde ...

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 Buckley Space Force Base is a United States Space Force base in Aurora, Colorado named after United States Army Air Service First Lieutenant John Harold Buckley. The base is run by Space Base Delta 2, with major units including the U.S. Space Fo ...

Colorado Colorado (, other variants) is a state in the Mountain states, Mountain West subregion of the Western United States. It encompasses most of the Southern Rocky Mountains, as well as the northeastern portion of the Colorado Plateau and the wes ...

. DEL 4 was based on the previous 460th Operations Group,

460th Space Wing The 460th Space Wing was the United States Space Force's space-based infrared surveillance, tracking, and missile warning wing. the 460th Space Wing was assigned to Space Operations Command and stationed at Buckley Air Force Base. The 460th Spa ...

and 21st Operations Group,

21st Space Wing The 21st Space Wing (21 SW) was the United States Space Force's ground–based missile warning and space control wing. The 21st Space Wing was assigned to Space Operations Command and headquartered at Peterson Air Force Base, Colorado. The 21st ...

Structure

List of commanders

References

Deltas of the United States Space Force {{US-mil-unit-stub