The Special Air Service (SAS) is a special forces unit of the British Army. It was founded as a regiment in 1941 by David Stirling and in 1950, it was reconstituted as a corps. The unit specialises in a number of roles including counter-terrorism, hostage rescue, direct action and covert reconnaissance. Much of the information about the SAS is highly classified, and the unit is not commented on by either the British government or the Ministry of Defence due to the secrecy and sensitivity of its operations.
The 1st Special Forces Operational Detachment–Delta, referred to variously as Delta Force, Combat Applications Group (CAG), Army Compartmented Elements (ACE), or within Joint Special Operations Command (JSOC), Task Force Green, is a special operations force of the United States Army, under operational control of JSOC. The unit's missions primarily involve counterterrorism, hostage rescue, direct action, and special reconnaissance, often against high-value targets.
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 Force's Space Delta 4, the Colorado Air National Guard's 140th Wing, the Denver Naval Operations Support Center, and the National Reconnaissance Office's Aerospace Data Facility-Colorado.
The 2nd Space Launch Squadron is an active United States Space Force unit. It is located at Vandenberg Space Force Base, California, and was reactivated in July 2019 with the merger of the 4th Space Launch Squadron and the 1st Air and Space Test Squadron.
The United States Air Force's 1st Space Launch Squadron was a space launch unit located at Cape Canaveral Air Force Station, Florida. It was responsible for USAF Delta II launches from its activation in October 1990 to its inactivation in August 2009.
The 18th Space Defense Squadron is a United States Space Force Space Domain Awareness unit located at Vandenberg Space Force Base, California. The 18th SDS is tasked with executing command and control of the space surveillance network (SSN), maintaining the resident space object (RSO) database and managing United States Space Command's space situational awareness (SSA) sharing program to United States, foreign government, commercial, and academic entities. The squadron also conducts advanced analysis, sensor optimization, conjunction assessment, human spaceflight support, reentry/break-up assessment, and launch analysis.
Space Training and Readiness Command is the United States Space Force's education, training, doctrine, and test field command. It is headquartered at Peterson Space Force Base, Colorado.
Space Delta 2 is the United States Space Force's space domain awareness and space battle management delta and is headquartered at Peterson Space Force Base, Colorado. Space Delta 2 tracks and monitors all human made objects from low Earth orbit to geosynchronous orbit and further out to deep space. It also partners with the National Oceanic and Atmospheric Administration to provide weather satellite observation for the U.S. Armed Forces. It consists of the 15th Space Surveillance, 18th Space Defense Squadron, 19th Space Defense Squadron, and 20th Space Surveillance Squadron.
Space Delta 3 is a United States Space Force unit responsible for presenting operational combat-ready space electromagnetic warfare forces in support of assigned missions. It is headquartered at Peterson Space Force Base.
Space Delta 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.
Space Base Delta 2 is a unit in the United States Space Force. It is assigned to Space Operations Command and headquartered at Buckley Space Force Base in Aurora, Colorado, United States.
The United States Space Force is organized by different units: the Space Staff, the field commands, and the space deltas.
Space Base Delta 1 is a United States Space Force unit. It is assigned to Space Operations Command and headquartered at Peterson Space Force Base in Colorado Springs, Colorado, United States.
Space Delta 7 is a United States Space Force unit responsible for Intelligence, Surveillance and Reconnaissance (ISR) for the United States Space Force. The delta provides actionable and time-sensitive intelligence for space domain operations including detection, characterization and targeting of adversary space capabilities. The unit employs a variety of fixed and mobile sensors across the globe operated by intelligence professionals to enable its mission to gain and maintain information dominance in the space domain in the execution of National Defense Strategy priorities. It is headquartered at Peterson Space Force Base.
Space Delta 8 is the United States Space Force unit responsible for military satellite communications and operates a variety of satellite constellation. It is headquartered at Schriever Space Force Base, Colorado.
The Space Operations Group is a Japan Air and Space Self-Defense Force unit based at Fuchu Air Base in Fuchu, Tokyo. It is responsible for the JASDF's space domain awareness capability, integrating surveillance data from a sensor near Sanyo-Onoda in Yamaguchi Prefecture, along with data supplied by JAXA and the United States Space Force. The unit also conducts satellite navigation and satellite communications for other military units.
Space Delta 18 is a United States Space Force unit that serves as the National Space Intelligence Center (NSIC). It is headquartered at Wright-Patterson Air Force Base, Ohio and activated on 24 June 2022.
Space Delta 1 is a United States Space Force unit responsible for space training. It runs the Space Force's basic military training, weapons school, and other advanced training courses and exercises. It was established on 23 August 2021 following the establishment of the Space Training and Readiness Command, the field command to which it reports. It is headquartered at Vandenberg Space Force Base, California.
The 3rd Combat Training Squadron is a United States Space Force training unit. Assigned to Space Operations Command's Space Delta 3, it provides electromagnetic warfare qualification training to Delta 3 operators. Headquartered at Peterson Space Force Base, Colorado, it was activated on 3 March 2022. The squadron was previously designated as the 721 Operations Support Squadron following the establishment of the 721st Operations Group in 2019 which was later redesignated to Space Delta 3.
The 2nd Space Analysis Squadron is a United States Space Force unit responsible for producing and delivering foundational intelligence on foreign threats to space operations supporting the warfighter, acquisitions, and national policy. It was originally activated on activated on 15 April 2008 as the Space Analysis Squadron of the Space and Missiles Analysis Group in the Air Force. It was redesignated as 2 SAS on 24 June 2022 and transferred to the Space Force as part of Space Delta 18.
United States
United States Space Force 
