107-716: The Defense Support Program ( DSP ) is a program of the United States Space Force that operated the reconnaissance satellites which form the principal component of the Satellite Early Warning System used by the United States. DSP satellites, which are operated by the 460th Space Wing , detect missile or spacecraft launches and nuclear explosions using sensors that detect the infrared emissions from these intense sources of heat. During Desert Storm , for example, DSP
214-471: A Delta Cryogenic Second Stage (DCSS)) and a 4-meter payload fairing. The Delta IV Medium was capable of launching 4,200 kg to geostationary transfer orbit (GTO). From Cape Canaveral, GTO is 1804 m/s away from GEO. The mass of fairing and payload attach fittings have been subtracted from the gross performance. The Delta IV Medium+ (4,2) (Delta 9240) had the same CBC and DCSS as the Medium, but with
321-672: A 4 m (13 ft) diameter DCSS that was retired with the Delta IV Medium and a 5 m (16 ft) diameter DCSS that remains in service with the Delta IV Heavy. The 4 m diameter version lengthened both Delta III propellant tanks, while the 5-meter version has an extended diameter liquid hydrogen tank and a further lengthened liquid oxygen tank. Regardless of the diameter, each DCSS is powered by one RL10B-2 engine, with an extendable carbon-carbon nozzle to improve specific impulse. Two different interstages are used to mate
428-472: A LEO payload of 14,800 kg (32,600 lb), and could have been available within 36 months of the first order. It was also considered to add extra GEM 60s to the M+ (5,4), which would have required adding extra attachment points, structural changes to cope with the different flight loads, and launch pad and infrastructure changes. The Medium+ (5,6) and (5,8) would have flown with six and eight SRBs respectively, for
535-481: A Payload Attach Fitting (240 kg to 1,221 kg depending on payload). Possible future upgrades for the Delta IV included adding extra strap-on solid motors, higher-thrust main engines, lighter materials, higher-thrust second stages, more (up to eight) strap-on CBCs, and a cryogenic propellant cross feed from strap on boosters to the common core. At one point, NASA planned to use Delta IV or Atlas V to launch
642-700: A Space Corps or Space Force in the late 1990s and early 2000s. The idea of establishing a Space Force was resurrected in the late 2010s in response to Russian and Chinese military space developments, resulting in the Space Force's establishment on 20 December 2019 during the Trump Administration . The Space Force is organized as part of the Department of the Air Force alongside the U.S. Air Force , its coequal sister service. The Department of
749-531: A Space Corps within the Department of the Air Force in the mid-term, which would evolve into a Department of the Space Force in the long-term. The Rumsfeld Commission expected the transition from Air Force Space Command to a fully independent Space Force to occur in between 2006 and 2011. Air Force leadership reacted extremely poorly to the Rumsfeld Commission's recommendations. The day after
856-399: A commission to examine the organization and management of national security space. The Commission to Assess United States National Security Space Management and Organization, better known as the 2001 Space Commission or the Rumsfeld Commission, released its report in 2001. The Rumsfeld Commission noted the strong risk of a "Space Pearl Harbor," harking back to Imperial Japan's surprise attack on
963-441: A design life of 1.25 years. Throughout the life of the program, the satellite design has undergone numerous improvements to enhance reliability and capability. The weight grew to 5,250 pounds (2380 kg), the power to 1275 watts, the number of detectors increased threefold to 6000 and the design life has been increased to a goal of ten years. The numerous improvement projects have enabled DSP to provide accurate, reliable data in
1070-457: A full color U.S. flag , sparking jokes about fighting on the forest moon of Endor from Star Wars: Return of the Jedi , while its distinctive service dress drew comparisons to Colonial Fleet uniforms from Battlestar Galactica or Starfleet uniforms from Star Trek . While the Space Force noted that its camouflage combat uniform was appropriate since space operators deploy to combat zones on
1177-501: A fully independent Space Force by 2011. While the United States' focus shifted from space to counterterrorism, the Russian Armed Forces and Chinese People's Liberation Army realized the military benefits that could be gleaned from space, as well as the incredible reliance the United States put on its space forces. Throughout the 2000s, Russian and Chinese space and counterspace capabilities began to increase. In 2001,
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#17327809687991284-543: A global space. Through space, the U.S. military and its allies can see, communicate, and navigate. Global mission operations also protect U.S. forces on Earth through early warning of incoming missiles and other types of attack. The Space Force describes global mission operations as allowing the rest of the U.S. military to defend the air, land, and sea. Missions that support global mission operations include missile warning , satellite communications , and positioning, navigation, and timing . Assured space access ensures that
1391-417: A higher degree of reliability. Boeing initially intended to market Delta IV commercial launch services. However, the Delta IV entered the space launch market when global capacity was already much higher than demand. Furthermore, as an unproven design it had difficulty finding a market in commercial launches, and Delta IV launch costs are higher than comparable vehicles of the same era. In 2003, Boeing pulled
1498-522: A maximum of up to 9,200 kg (20,300 lb) to GTO with the M+ (5,8). The Medium+ (5,6) and (5,8) could have been available within 48 months of the first order. The Vulcan Centaur is planned to replace the Atlas V and Delta IV rockets. Vulcan Centaur had been projected to enter service by 2023, using the BE-4 methane -fueled rocket engine, but the first Vulcan launched on 8 January 2024. The Atlas V
1605-470: A military responsibility until the National Aeronautics and Space Administration was created in 1958. The military shifted from conducting their own space exploration programs to supporting NASA's, providing the agency with its astronauts and space launch vehicles , while also conducting astronaut recovery and supporting space launches from the Air Force's Eastern Range . The Air Force
1712-519: A new military service...would be a dramatic step. Perhaps a "Space Corps" would be a step toward a Space Force. Maybe the Air Force will preempt these dramatic changes by truly becoming the "Space and Air Force." The idea of a separate service for space originated in the 1960s. Military space activities were briefly consolidated under the Advanced Research Projects Agency in 1958, loosely centralizing space activities under
1819-525: A possible "DSP malfunction." The DSP constellation may have offered an excellent vantage point for an early warning system against state-centric threats such as missiles, but military analysts warn its ability to collect intelligence on non-state actors is severely limited. United States Space Force As U.S. Space Force The United States Space Force ( USSF ) is the United States Armed Forces ' space service and one of
1926-414: A separate military department, to be known as the Department of the Space Force. The Space Force is currently organized as a service under the Department of the Air Force , more closely mirroring the concept of a Space Corps rather than a fully independent Space Force. Senator Bob Smith , the 2001 Rumsfeld Commission, and 2008 Allard Commission each envisioned that a Space Corps would first be created under
2033-519: A single organization. The Air Force, Army, and Navy feared that it would evolve into a "fourth service" for space, before authorities were returned to the service. The first direct call for a U.S. Space Force occurred in 1982, prior to Air Force Space Command 's establishment or the Strategic Defense Initiative 's public announcement. As part of a report recommending the acceleration U.S. space-based laser weapon development,
2140-562: A study calling for its transfer to the Space Force. Delta IV rocket Delta IV was a group of five expendable launch systems in the Delta rocket family . It flew 45 missions from 2002 to 2024. Originally designed by Boeing 's Defense, Space and Security division for the Evolved Expendable Launch Vehicle (EELV) program, the Delta IV became a United Launch Alliance (ULA) product in 2006. The Delta IV
2247-455: Is an historic event and a strategic imperative for our Nation. Space has become so important to our way of life, our economy and our national security that we must be prepared as a Nation to protect it from hostile actions. As the U.S. Space Force was established on 20 December 2019, General Jay Raymond , commander of U.S. Space Command and Air Force Space Command , became its first member and chief of space operations . Air Force Space Command
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#17327809687992354-535: Is expected to stay in service for a few years after Vulcan's inaugural launch, and the Delta IV Heavy was discontinued in April 2024. The Delta IV Medium (also referred to as 'single stick' ) was available in four configurations: Medium, Medium+ (4,2), Medium+ (5,2), and Medium+ (5,4). The Delta IV Medium (Delta 9040) was the most basic Delta IV. It featured a single CBC and a modified Delta III second stage, with 4-meter liquid hydrogen and liquid oxygen tanks (called
2461-474: Is now adrift in geosynchronous orbit and remains a potential hazard to other craft. The Department of Defense sent a MiTEx spacecraft to inspect DSP 23 sometime in 2008. Another DSP satellite was lost in 1999, DSP-19, after its Inertial Upper Stage failed following launch from a Titan 4B booster. DSP-19 was a USAF Defense Support Program missile early warning satellite equipped with an infrared telescope to detect rocket launches. The Titan 4B rocket placed
2568-450: Is responsible for development and acquisition of the satellites. The Defense Support Program replaced the 1960s space-based infrared Missile Defense Alarm System (MIDAS). The first successful launch of MIDAS (MIDAS-2) was 24 May 1960 and there were twelve launches before the DSP program replaced it in 1970. Benefiting from funds released by the cancellation of Manned Orbiting Laboratory ,
2675-631: The United States Space Force Act , the Space Force is organized, trained, and equipped to: The Department of Defense further defines the specified functions of the Space Force to: The Space Force further breaks down its mission into three core functions, which align directly to its mission statement to "secure our Nation's interests in, from, and to space:" Space superiority defends against space and counterspace threats by protecting spacecraft in space or protecting against attacks enabled by adversary spacecraft, requiring that
2782-645: The 2nd Space Warning Squadron , that operate DSP satellites and report warning information, via communications links, to the NORAD and USSTRATCOM early warning centers within the Cheyenne Mountain Space Force Station , Colorado. These centers immediately forward data to various agencies and areas of operations around the world. The SBIRS Wing at the Space Systems Command , Los Angeles Space Force Base , California
2889-585: The Air Force Research Laboratory . The Space Force also began incorporating space personnel transfers from the U.S. Army, U.S. Navy, and U.S. Marine Corps. In 2022, it the Naval Satellite Operations Center and Army's Satellite Operations Brigade transferred to the Space Force, putting satellite communications under a single service for the first time in history. In 2023, it assumed responsibility for
2996-498: The Army Air Forces , tasked General Bernard Schriever to integrate with the scientific community to identify and develop technologies that could be beneficial for the new U.S. Air Force in the next global conflict. Identifying the importance of space, the U.S. Army , U.S. Navy , and U.S. Air Force each started their own separate space and rocket programs. The U.S. Air Force created the first military space organization in
3103-504: The Department of the Navy . The Space Force's three field commands (FLDCOM) are purpose-built for specific activities, aligning to the various institutional responsibilities to organize, train, and equip Guardians. Component field commands (C-FLDCOM) coordinate and integrate space forces into planning and current operations within unified combatant commands . Direct reporting units (DRU) are hubs of innovation and intelligence expertise within
3210-502: The Government Accountability Office recommended the U.S. Air Force be reorganized as the U.S. Aerospace Force or that an independent U.S. Space Force be created. Ultimately, a Congressional proposal to rename the U.S. Air Force as the U.S. Aerospace Force and speculation that President Ronald Reagan may announce the creation of a U.S. Space Force accelerated Air Force plans to create a space command within
3317-600: The Kosmos 1408 and putting the International Space Station at risk. The Space Force is organized into a headquarters staff that provides leadership and guidance for the force; field commands that are responsible for organizing, training, and equipping Guardians; deltas that support field commands and are specialized by mission area; and squadrons which specialize in acquisitions, cyberspace operations, engineering, intelligence, and space operations. At
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3424-624: The Persian Gulf War , which has been referred to as the "first space war." The Strategic Defense Initiative and creation of Air Force Space Command in the 1980s marked a renaissance for military space operations. Proposals for a U.S. Space Force were first seriously considered during the Reagan Administration as part of the Strategic Defense Initiative. Congress began exploring establishing
3531-669: The Russian Space Forces were reestablished as an independent arm and in 2007, China conducted a destructive anti-satellite missile test causing the single largest space debris generating event in history. In the aftermath of the Chinese ASAT test, Congress tasked the Allard Commission to reevaluate the Defense Department's space organization and management. The Allard Commission noted that
3638-608: The Secretary of Defense to conduct a periodic review to determine when to recommend the President seek legislation to establish the Department of the Space Force. Following the Space Force's establishment there have been a number of calls to rename the Department of the Air Force to the Department of the Air and Space Forces to reflect its composition of the U.S. Air Force and U.S. Space Force. Congress previously explored renaming
3745-596: The Space and Missile Systems Center from Air Force Materiel Command to Air Force Space Command and establishing the National Security Space Institute . Ultimately, the Rumsfeld Commission's recommendations remained unfulfilled because of the higher priority placed on counterterrorism after the September 11 attacks , canceling plans for a Space Corps within the Department of the Air Force or
3852-563: The Vietnam War , with Air Force weather and communications spacecraft supporting ground, sea, and air operations. During Operation Urgent Fury in Grenada, satellite communications were used to conduct command and control for the first time, while Operation El Dorado Canyon and Operation Just Cause marked the first time that major U.S. forces incorporated information from space-based intelligence systems. The Persian Gulf War marked
3959-766: The unified combatant commands , assuming space component responsibility from the U.S. Air Force. One of the primary reasons the Space Force was created was to consolidate space forces from across the U.S. Air Force, U.S. Army, and U.S. Navy. In 2020, the Space Training and Readiness Delta (Provisional) was established to form the foundation for Space Training and Readiness Command and incorporate Air Force space units spread across Air Combat Command and Air Education and Training Command , while Space Systems Command incorporated space acquisitions activities across Air Force Materiel Command , although, notably it did not incorporate space research and development conducted by
4066-508: The Air Force did successfully field the Program 437 anti-satellite weapon system, which used nuclear Thor missiles to intercept enemy spacecraft. Although most military space forces were organized under the Air Force, they were still fragmented within several different major commands. Recognizing rapid growth of space forces and the need to centralize them under one command, the Air Force established Air Force Space Command in 1982. This
4173-591: The Air Force is headed by the civilian secretary of the Air Force , while the U.S. Space Force is led by the Chief of Space Operations . The U.S. Space Force's status as part of the Department of the Air Force is intended to be an interim measure towards a fully independent Department of the Space Force, led by a civilian secretary of the Space Force. Secure our Nation's interests in, from, and to space. The Space Force's statutory responsibilities are outlined in 10 U.S.C. § 9081 and originally introduced in
4280-455: The Air Force or a separate Department of the Space Force to unify national security space. It took until 2017 for members of Congress to act on the recommendations of the Rumsfeld and Allard commissions to create a Space Corps within the Department of the Air Force. Representatives Mike Rogers and Jim Cooper unveiled a bipartisan proposal to establish a Space Corps within the Department of
4387-570: The Air Force's major commands. It also consolidated Air Force wings and groups into mission deltas, a formation roughly equivalent to an Army Brigade Combat Team or Air Force expeditionary wing, and space base deltas (briefly known as garrisons), equivalent to an Army garrison or Air Force air base wing. It also began to rename former Air Force bases and station to Space Force bases and station, starting with Patrick Space Force Base and Cape Canaveral Space Force Station . It also established component field commands to serve as Space Force components at
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4494-465: The Air Force, however it experienced significant opposition from the Air Force and Defense Department, failing in the Senate. However, the proposal was resurrected in 2018 when President Donald Trump publicly endorsed the creation of a Space Force and directed the Defense Department to reverse its opposition and develop plans for its establishment. The Trump Administration plan for the U.S. Space Force
4601-542: The Army's Joint Tactical Ground Station , putting all space-based missile warning under the Space Force. The Space Force's first significant combat action occurred less than a month after its establishment, providing missile warning when Iran launched missile strikes against U.S. troops at Al Asad Airbase on 7 January 2020. In 2021, the Russian Federation conducted an anti-satellite weapons test, destroying
4708-526: The Commission was publicly released Air Force Chief of Staff General Michael E. Ryan declared "an independent Space Force or Corps was not warranted for at least another 50 years." General Ryan doubled down over the following year, stating that a Space Force should only be considered once space operations moved beyond Earth orbit. Despite the Air Force's hostility to the idea of a Space Corps or Space Force, they did meet some recommendations by transferring
4815-629: The Delta IV Medium by 2018. With the exception of the first launch, which carried the Eutelsat W5 commercial communications satellite, all Delta IV launches have been paid for by the US government. In 2015, ULA stated that a Delta IV Heavy is sold for nearly US$ 400 million. The possibility of a higher performance Delta IV was first proposed in a 2006 RAND Corporation study of national security launch requirements out to 2020. A single National Reconnaissance Office (NRO) payload required an increase in
4922-563: The Delta IV from the commercial market, citing low demand and high costs. In 2005, Boeing stated that it sought to return the Delta IV to commercial service. As of 2009, the USAF funded Delta IV EELV engineering, integration, and infrastructure work through contracts with Boeing Launch Services (BLS). On 8 August 2008, the USAF Space and Missile Systems Center increased the "cost plus award fee" contract with BLS for US$ 1.656 billion to extend
5029-576: The Delta IV's development, a small variant was considered. This would have featured the Delta II second stage, an optional Thiokol Star 48B third stage, and the Delta II payload fairing, all atop a single Common Booster Core (CBC). The Small variant was dropped by 1999. In 2002, the Delta IV was first launched, with the RS-68 becoming the first large liquid-propellant rocket engine designed in
5136-399: The Department of the Air Force as an interim measure as it grew into a fully independent Space Force. In 2019, Space Policy Directive-4 directed the Space Force be initially established under the Department of the Air Force as the first step towards an independent Department of the Space Force, which would take over the entire space mission from the Department of the Air Force. It also directed
5243-491: The Department of the Air Force to the Department of the Aerospace Force in 1981 and congressional efforts were made in the 2000s to rename the Department of the Navy to the Department of the Navy and Marine Corps, however both of these proposals failed under opposition from the Defense Department. Space Force advocates have also called for the creation of an undersecretary of the Air Force for space . This provision
5350-688: The Earth alongside the rest of the joint force and it saved money, it did not have a similar response for its service dress uniform, which were described as a "futuristic-looking" design by General Raymond. The Space Force's seal and delta insignia were also incorrectly derided as a rip-off of Star Trek' s Starfleet logo, despite being first adopted as a space symbol by the Air Force Ballistic Missile Division in 1962, four years before Star Trek first aired on television in 1966. Star Trek actor William Shatner settled
5457-627: The East coast of the United States used Space Launch Complex 37 (SLC-37) at the Cape Canaveral Air Force Station . On the West coast, polar-orbit and high-inclination launches used Vandenberg Space Force Base 's Space Launch Complex 6 (SLC-6). Launch facilities at both sites are similar. A Horizontal Integration Facility (HIF) is situated some distance from the pad. Delta IV CBCs and second stages to be mated and tested in
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#17327809687995564-635: The HIF before they are moved to the pad. The partial horizontal rocket assembly of the Delta IV is somewhat similar to the Soyuz launch vehicle , which is completely assembled horizontally. The Space Shuttles , the past Saturn launch vehicles , and the Space Launch System are assembled and rolled out to the launch pad entirely vertically. Movement of the Delta IVs among the various facilities at
5671-506: The Heavy, the main CBC's engine throttles down to 58% rated thrust around 50 seconds after liftoff, while the strap-on CBCs remain at 102%. This conserves propellant and allows the main CBC to burn after booster separation. After the strap-on CBCs separate, the main CBC's engine again throttles up to 102% before throttling back down to 58% prior to main engine cutoff. The RS-68 engine is mounted to
5778-479: The IUS upper stages and payload into a 188 km x 718 km x 28.6° parking orbit. The first stage on the IUS burned at 18:14 GMT and put the second stage and payload into a geosynchronous transfer orbit. The IUS second stage fired at 23:34 GMT. However, the two stages of the IUS failed to separate completely. At least one connector remained attached. This meant the second stage motor nozzle did not extend properly. When
5885-515: The Medium+ (5,2) could launch 5,072 kg to GTO. The Delta IV Medium+ (5,4) (Delta 9450) was similar to the Medium+ (5,2), but used four GEM 60s instead of two, enabling it to lift 6,882 kg to GTO. To encapsulate the satellite payload, a variety of different payload fairings were available. A stretched Delta III 4-meter diameter composite payload fairing was used on 4-meter Medium versions, while an enlarged, 5-meter diameter composite fairing
5992-635: The Persian Gulf War being coined "the first Space War." While U.S. space forces supported all U.S. military operations in the 1990s, Operation Allied Force marked the first use of Global Positioning System -aided munitions in a conflict, ushering in a new era of precision bombing. Following the September 11 attacks , U.S. space forces mobilized to respond as part of the Global War on Terrorism Operation Enduring Freedom , Operation Iraqi Freedom , and Operation Inherent Resolve . Creating
6099-524: The Space Force and the Center for Strategic and International Studies has also proposed moving missile defense into the Space Force. The Army also continues to maintain a cadre of Functional Area 40 space operations officers, although over 85% indicated they would transfer to the Space Force if able. The Army is also maintaining the 1st Space Brigade , however the RAND Corporation has conducted
6206-455: The Space Force can deploy and sustain equipment in outer space. This includes space launches as well as controlling and steering spacecraft out of the way of oncoming space debris to avoid collisions. The Space Force describes assured access to space as being able to make sure it can continue launching and conducting space operations 24/7. Missions supporting space access include launch , range control, cyber , and space domain awareness . In
6313-506: The Space Force establish control of the domain. The Space Force describes that at a time and place of the United States' choosing it must be able to assure continued use of spacecraft and deny adversaries use of their spacecraft or space-enabled capabilities. Mission that support space superiority include orbital warfare , electromagnetic warfare , and space battle management . Global mission operations integrates joint functions across all domains (land, air, maritime, space, cyberspace) on
6420-551: The Space Force, providing new ideas or deep knowledge about highly specialized issues. While the Space Force's headquarters is in Washington, D.C., the rest of the service is spread across the United States and abroad, across 18 states and territories and 46 bases and installations as of 2024. As the United States Space Force matures, and as national security requires, it will become necessary to create
6527-400: The U.S. Pacific Fleet in 1941. It was extremely critical of the Air Force's treatment of space, with few witnesses expressing confidence that the Air Force would address the requirement to provide space capabilities to the other services or move beyond treating space as just a support capability for air operations. The most significant recommendation of the Rumsfeld Commission was the creation of
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#17327809687996634-491: The United States since the Space Shuttle main engine (SSME) in the 1970s. The L3 Technologies Redundant Inertial Flight Control Assembly (RIFCA) guidance system originally used on the Delta IV was common to that carried on the Delta II , although the software was different because of the differences between the Delta II and Delta IV. The RIFCA featured six ring laser gyroscopes and accelerometers each, to provide
6741-416: The United States' dependence on space had increased, but comparatively little...[had] been achieved to make them more secure." It also noted, despite the recommendations of the Rumsfeld Commission, authority and responsibility for national security space remained fragmented and unfocused. Like the 2001 Rumsfeld Commission, the 2008 Allard Commission recommended establishing a Space Corps within the Department of
6848-415: The addition of two Orbital ATK -built 1.5-m (60-in) diameter solid rocket booster Graphite-Epoxy Motors (GEM 60s) strap-on boosters to increase payload capacity to 6,150 kg to GTO. The Delta IV Medium+ (5,2) (Delta 9250) was similar to the Medium+ (4,2), but had a 5-m–diameter DCSS and payload fairing for larger payloads. Because of the extra weight of the larger payload fairing and second stage,
6955-596: The back of the CBC is a cable tunnel to hold electrical and signal lines, and a feedline to carry the liquid oxygen to the RS-68 from the tank. The CBC is of a constant, 5 m (16 ft) diameter. The upper stage of the Delta IV was the Delta Cryogenic Second Stage (DCSS). The DCSS was based on the Delta III upper stage but has increased propellant capacity. Two versions have been produced:
7062-512: The case of Delta IV, the vehicle was completed on the launch pad inside a building. This Mobile Service Tower (MST) provides service access to the rocket and protection from the weather and is rolled away from the rocket on launch day. A crane at the top of the MST lifts the encapsulated payload to the vehicle and also attached the GEM 60 solid motors for Delta IV Medium launches. The MST is rolled away from
7169-454: The conclusion of the Delta rocket family. Each Delta IV consists of at least one Common Booster Core (CBC). Each CBC is powered by one Aerojet Rocketdyne RS-68 engine, which burns liquid hydrogen and liquid oxygen . On flights of the Medium, the RS-68 ran at 102% rated thrust for the first few minutes of flight, and then throttled down to 58% rated thrust before main engine cutoff. On
7276-492: The eight uniformed services of the United States . It is one of two independent space forces in the world. The United States Space Force traces its origins to the Air Force, Army, and Navy's military space programs created during the beginning of the Cold War . US military space forces first participated in combat operations during the Vietnam War and have participated in every U.S. military operation since, most notably in
7383-431: The establishment of a Space Force if the Air Force could not, or would not, embrace spacepower. An independent Department of the Space Force would ensure that space got its fair share of resources within the Defense Department, with Senator Smith calling for the creation of a Space Corps within the Department of the Air Force as a bridge to a fully independent Space Force. In 2000, Senator Smith led Congress in establishing
7490-457: The existing military space forces across the Army, Navy, and Air Force. While the Navy and Air Force gave up all of their space forces, the greatest resistance to transferring space forces came from the Army. While the Army transferred its satellite communications and missile warning assets, there are still calls for it to transfer 1st Space Brigade and 100th Missile Defense Brigade to the Space Force. The Heritage Foundation has called for
7597-444: The face of evolving missile threats. On-station sensor reliability has provided uninterrupted service well past their design lifetime. Recent technological improvements in sensor design include above-the-horizon capability and improved resolution. Increased on-board signal-processing capability improves clutter rejection. Enhanced reliability and survivability improvements were also incorporated. The 23rd, and last DSP satellite (DSP-23)
7704-646: The first CORONA reconnaissance mission, recovering 3,000 feet of film from space and imaged 1.65 million square miles of the Soviet Union's territory. Concerned about the development of the Soviet Union's own space forces, the Air Force advocated for a military human spaceflight program. General Curtis LeMay described strong parallels between World War I aviation and 1960s space operations, noting how quickly flying evolved from chivalric and unarmed reconnaissance flights to combat efforts designed to destroy enemy air superiority . General LeMay believed that it
7811-413: The first launch of a DSP (IMEWS-1 - Integrated Missile Early Warning Satellite ) was on 6 November 1970 and since then it has become the mainstay of the United States ballistic missile early warning system. For the last 45 years they have provided an uninterrupted space-based early warning capability. The original DSP satellite weighed 2,000 pounds (900 kg) and had 400 watts of power, 2000 detectors and
7918-441: The first stage and DCSS. A tapering interstage that narrowed down from 5 m to 4 m diameter was used to mate the 4 m DCSS to the CBC, while a cylindrical interstage is used to mate the 5 m DCSS. Both interstages were built from composites and enclosed the liquid oxygen tank, with the larger liquid hydrogen tank making up part of the vehicle's outer mold line. Delta IV launched from either of two rocket launch complexes . Launches on
8025-515: The first time that military space forces were unleashed to their fullest extent. Over sixty spacecraft provided 90% of theater communications and command and control for a multinational army of 500,000 troops, weather support for commanders and mission planners, missile warning of Iraqi Scud missile launches, and satellite navigation for air and land forces moving across a featureless desert. The decisive role that space forces played directly enabled an overwhelming Coalition victory and led to
8132-481: The headquarters level, the Space Force is led by the Chief of Space Operations , a four-star general who reports to the Secretary of the Air Force and provides military advice to civilian leadership of the Department of Defense and the White House . Alongside the U.S. Air Force and U.S. Space Force combine to form the Department of the Air Force, like how the U.S. Navy and U.S. Marine Corps combine to form
8239-653: The issue, recalling that Starfleet's logo was chosen as an homage to the Space Force's direct predecessors in military space operations. The service also chose the title "Guardian" to represent its personnel, becoming its counterpart to Soldier and Airman. The term "Guardian" has a long history within Air Force Space Command, originally serving as part of its motto: "Guardians of the High Frontier." The Space Force also adopted Semper Supra as its official motto and unveiled its service song , sharing
8346-642: The lift capability of the Delta IV Heavy. Lift capacity was increased by developing the higher-performance RS-68A engine, which first flew on 29 June 2012. ULA phased out the baseline RS-68 engine with the launch of Delta flight 371 on 25 March 2015. All following launches used the RS-68A, and the engine's higher thrust allowed the use of a single standardized CBC design for all Delta IV Medium and M+ versions. This upgrade reduced cost and increased flexibility, since any standardized CBC could be configured for zero, two, or four solid-propellant rocket boosters. However,
8453-506: The long haul, our safety as a nation may depend upon achieving "space superiority." Several decades from now, the important battles may not be sea battles or air battles, but space battles, and we should be spending a certain fraction of our national resources to ensure that we do not lag in obtaining space supremacy. The beginnings of the U.S. Space Force can be traced to the Aftermath of World War II . General Henry H. Arnold , commander of
8560-418: The lower thrust structure of the CBC by a four-legged ( quadrapod ) thrust frame and enclosed in a protective composite conical thermal shield. Above the thrust structure is an aluminum isogrid (a grid pattern machined out of the inside of the tank to reduce weight) liquid hydrogen tank, followed by a composite cylinder called the centerbody, an aluminum isogrid liquid oxygen tank, and a forward skirt. Along
8667-433: The new CBC led to a slight performance loss for most medium configurations. The Delta IV Heavy required non-standard CBCs for the core and boosters. Payload capacities after RS-68A upgrade 407 km x 51.6° 1800 m/s residual Payload capacities with original RS-68 Version Fairing CBCs SRBs Payload to LEO 407 km x 51.6° Payload to GTO 1800 m/s residual Launches *Masses include
8774-423: The pad was facilitated by rubber-tired Elevating Platform Transporters (EPTs) and various transport jigs. Diesel engine EPTs are used for moving the vehicles from the HIF to the pad, while electric EPTs are used in the HIF, where precision of movement is important. The basic launchpad structure includes a flame trench to direct the engine plume away from the rocket, lightning protection, and propellant storage. In
8881-538: The period of performance through the 30 September 2008 ( FY09 ). In addition, a US$ 557.1 million option was added to cover FY10. In February 2010, naturalized citizen Dongfan Chung, an engineer working with Boeing, was the first person convicted under the Economic Espionage Act of 1996 . Chung passed on classified information on designs including the Delta IV rocket to China and was sentenced to 15 years. In March 2015, ULA announced plans to phase out
8988-702: The proposed Orbital Space Plane , which eventually became the Crew Exploration Vehicle and then the Orion . Orion was intended to fly on the Ares I launch vehicle, then the Space Launch System after Ares I was cancelled. In 2009, The Aerospace Corporation reported on NASA results of a study to determine the feasibility of modifying Delta IV to be crew-rated for use in NASA human spaceflight missions. According to Aviation Week & Space Technology
9095-449: The rocket several hours before launch. At Vandenberg, the launch pad also has a Mobile Assembly Shelter (MAS), which completely encloses the vehicle; at CCAFS, the vehicle is partly exposed near its bottom. Beside the vehicle is a Fixed Umbilical Tower (FUT), which has two (VSFB) or three (CCAFS) swing arms. These arms carry telemetry signals, electrical power, hydraulic fluid, environmental control air flow, and other support functions to
9202-580: The same name. The decision on if the Space Force's ranks would mirror the Army, like the Air Force and Marine Corps, or the Navy, generated significant controversy, with Congressman Dan Crenshaw introducing an amendment which would force the Space Force to pattern itself after the Navy's rank structure. Ultimately, the amendment failed and the Space Force followed an Air Force/Army/Marine Corps-based rank scheme. The Space Force began to officially incorporate former Air Force Space Command units in 2020 and 2021, standing up field commands to serve as counterparts to
9309-458: The service gained its first astronaut when Colonel Michael S. Hopkins swore into the Space Force aboard the International Space Station on 18 December 2020. The Space Force also began to build out its culture and identity, however, it experienced several public relations challenges due to its perceived ties to science fiction and links to President Trump. The Space Force adopted the Army and Air Force's OCP Uniform with blue stitching and
9416-519: The service. Following the Persian Gulf War , the Air Force and Defense Department declared that "space power has now become as important to the nation as land, sea, and air power." Despite this public pronouncement, a growing section of Congress believed that space was being shortchanged and used only as an auxiliary to air operations. In 1998, drawing parallels between the challenges faced by post-World War I Army Aviators and post-Gulf War Air Force space operators, Senator Bob Smith publicly called for
9523-688: The stage fired, the vehicle tumbled during the burn and the satellite was left out of control in a useless orbit. The project was originally to have had 25 satellites, but the last two have been canceled, mainly due to SBIRS. DSP satellites have been replaced by the Space-Based Infrared System (SBIRS) satellites. There were five major improvement programs on the 23 satellites: More recently, there has been some effort put into using DSPs' infrared sensors as part of an early warning system for natural disasters like volcanic eruptions and forest fires. The movie War Games (1983) mentions
9630-421: The study, "found that a Delta IV heavy [...] could meet NASA's requirements for getting humans to low Earth orbit". A proposed upgrade to the Delta IV family was the addition of extra solid motors. The Medium+ (4,4) would have used existing mount points to pair the four GEM 60s of the M+ (5,4) with the upper stage and fairing of the (4,2). An M+ (4,4) would have had a GTO payload of 7,500 kg (16,500 lb),
9737-538: The wholesale transfer of United States Army Space and Missile Defense Command , to include the 100th Missile Defense Brigade and the 1st Space Brigade . The 100th Missile Defense Brigade operates the Ground Based Interceptor system and is located at Schriever Space Force Base , Vandenberg Space Force Base , and Fort Greely . Former Air Force space officers have called to move the missile defense and intercontinental ballistic missile mission to
9844-604: The world, establishing the Western Development Division in 1954 and placing it under the command of General Schriever. The Army followed a year later, creating the Army Ballistic Missile Agency under the leadership of General John Bruce Medaris and Dr. Wernher von Braun . The Army led the United States into space, launching the first American spacecraft, Explorer 1 , on 31 January 1958. Space exploration continued to be
9951-594: Was able to detect the launches of Iraqi Scud missiles and provide timely warnings to civilians and military forces in Israel and Saudi Arabia . The satellites are in geosynchronous orbits , and are equipped with infrared sensors operating through a wide-angle Schmidt camera . The entire satellite spins so that the linear sensor array in the focal plane scans over the Earth six times every minute. Typically, DSP satellites were launched on Titan IV B boosters with Inertial Upper Stages . However, one DSP satellite (DSP-16)
10058-438: Was followed by the establishment of the joint United States Space Command in 1985, aligning Air Force Space Command, Naval Space Command , and Army Space Command under a single operational commander. These two moves, along with the Strategic Defense Initiative 's establishment by President Ronald Reagan , led to a renaissance of military space operations in the 1980s. Space forces were first used in combat operations during
10165-632: Was immediately redesignated as United States Space Force, however, the command and its 16,000 Airmen technically remained part of the Air Force. On 3 April 2020, Chief Master Sergeant Roger A. Towberman became the Space Force's second member and was appointed its first senior enlisted leader . The service gained its first new second lieutenants when 86 members of the U.S. Air Force Academy class of 2020 became Space Force members 3 through 88 on 18 April 2020. Currently serving Air Force space operators began to become Space Force members in September 2020 and
10272-512: Was in April 2024. Delta IV vehicles were built in the ULA facility in Decatur, Alabama . Final assembly was completed at the launch site by ULA: at the horizontal integration facility for launches from SLC-37B pad at Cape Canaveral and in a similar facility for launches from SLC-6 pad at Vandenberg Space Force Base . The latest evolutionary development of the Delta rocket family , Delta IV
10379-492: Was included in the Trump Administration's original legislative proposal to give the Space Force additional independence and autonomy but was removed by the Senate. There have also been numerous calls from inside and outside the Space Force for it to have its own public affairs and judge advocate generals, independent from Air Force. When the Space Force was established in 2019 it was intended to consolidate
10486-500: Was introduced to meet the requirements of the United States Air Force's (USAF) Evolved Expendable Launch Vehicle (EELV, now National Security Space Launch (NSSL)) program. While the Delta IV retains the name of the Delta family of rockets, major changes were incorporated. Perhaps the most significant change was the switch from kerosene to liquid hydrogen fuel, with new tankage and a new engine required. During
10593-765: Was launched using the Space Shuttle Atlantis on mission STS-44 (24 November 1991). The last known DSP satellite (flight 23) was launched in 2007 aboard the first operational flight of the Delta IV Heavy rocket, as the Titan IV had been retired in 2005. All 23 satellites were built by the prime contractor Northrop Grumman Aerospace Systems , formerly TRW , in Redondo Beach , California . The 460th Space Wing , with headquarters at Buckley Space Force Base , Colorado , has units, primarily
10700-575: Was naive to believe that the same trends were not expected to be seen in space and must be prepared for. Although the Air Force made significant progress in developing the X-20 spaceplane , Manned Orbiting Laboratory , and Blue Gemini , opposition from the Department of Defense prevented operational fielding. The Air Force was also forced to cancel Project SAINT , a satellite inspector with satellite neutralization capabilities, when details were leaked to The New York Times in 1962. Despite these setbacks,
10807-572: Was outlined in Space Policy Directive-4, initially organizing the U.S. Space Force as part of the Department of the Air Force, but with plans to build out a separate Department of the Space Force in the future. In 2019, Congress passed legislation establishing the U.S. Space Force as a military service under the Department of the Air Force. On 20 December 2019, the National Defense Authorization Act
10914-444: Was primarily a launch vehicle for United States Air Force (USAF) military payloads, but was also used to launch a number of United States government non-military payloads and a single commercial satellite. The Delta IV had two main versions which allowed the family to cover a range of payload sizes and masses: the Medium (which had four configurations) and Heavy . The final flight of Medium occurred in 2019. The final flight of Heavy
11021-419: Was recognized as the lead military service for space by the early 1960s, with the Army and Navy operating in supporting roles. Early military space efforts were focused on developing and fielding spacecraft to accomplish national objectives, with a focus on weather , reconnaissance and surveillance , communications , and navigation . On 18 August 1961, the Air Force and National Reconnaissance Office launched
11128-453: Was scheduled to be launched on 1 April 2007, aboard a Delta IV Heavy rocket , but the launch was postponed until mid-August 2007 after two structural cracks were found in the metal launch table at pad 37B, caused by a fuel leak during testing. Further delays forced the launch back to 11 November 2007, when the satellite launched at 01:50:00 UTC (20:50 EST on 10 November). This satellite died in space sometime during 2008, for reasons unknown. It
11235-399: Was signed into law and the U.S. Space Force was established as the sixth armed service, meeting the Rumsfeld and Allard commissions' recommendations to create a Space Corps within the Department of the Air Force, but still falling short of creating a separate Department of the Space Force. We are at the dawn of a new era for our Nation’s Armed Forces. The establishment of the U.S. Space Force
11342-521: Was standard on the Delta IV Heavy, with an aluminum isogrid fairing also available. The aluminum trisector (three-part) fairing was built by Boeing and derived from a Titan IV fairing. The trisector fairing was first used on the DSP-23 flight. The Delta IV with the extended fairing is over 62 m (203 ft) tall. The last launch took place on 9 April 2024, carrying the NROL-70 satellite, marking
11449-428: Was used on 5-meter Medium versions. The Medium (4,2) version last flew on 22 August 2019, marking the retirement of the Delta IV Medium variants. The Delta IV Heavy (Delta 9250H) combines a 5 m (16 ft) diameter DCSS and payload fairing with two additional CBCs. These are strap-on boosters which are separated earlier in the flight than the center CBC. As of 2007, a longer 5 meter diameter composite fairing
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