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126-724: As U.S. Space Force The United States Space Force ( USSF ) is the United States Armed Forces ' space service and one of 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

252-515: A Hohmann transfer orbit to reach the particular orbit that is required. This minimises the airdrag as well as minimising the time that the vehicle spends holding itself up. Airdrag is a significant issue with essentially all proposed and current launch systems, although usually less so than the difficulty of obtaining enough kinetic energy to simply reach orbit. If the Earth's gravity is to be overcome entirely, then sufficient energy must be obtained by

378-406: 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 was immediately redesignated as United States Space Force, however, the command and its 16,000 Airmen technically remained part of

504-591: 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

630-418: 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 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

756-399: 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

882-457: 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

1008-499: 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,

1134-541: 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

1260-427: A large pool of professional volunteers . The U.S. has used military conscription , but not since 1973. The Selective Service System retains the power to conscript males, requiring the registration of all male citizens and residents of the U.S. between the ages of 18 and 25. The U.S. Armed Forces are considered the world's most powerful military, especially since the end of the Cold War . The military expenditure of

1386-428: A larger factor and speed a lesser one. At lower altitudes, due to the high speed required to remain in orbit, air friction is an important consideration affecting satellites, much more than in the popular image of space. At even lower altitudes, balloons, with no forward velocity, can serve many of the roles satellites play. Many cargos, particularly humans, have a limiting g-force that they can survive. For humans this

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1512-486: 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 was recognized as

1638-519: 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

1764-425: A number of alternatives to rockets have been proposed. In some systems, such as a combination launch system, skyhook , rocket sled launch , rockoon , or air launch , a portion of the total delta-v may be provided, either directly or indirectly, by using rocket propulsion. Present-day launch costs are very high – $ 2,500 to $ 25,000 per kilogram from Earth to low Earth orbit (LEO). As a result, launch costs are

1890-511: 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

2016-555: 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 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

2142-472: 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

2268-683: A single organization. The mission of Army Aviation is to find, fix and destroy any enemy through fire and maneuver and to provide combat support and combat service support in coordinated operations as an integral member of the combined arms team. Major aircraft include the AH-64 Apache , which serves as the Army's attack helicopter, the UH-60 Black Hawk , and the CH-47 Chinook for troop and cargo transport. Army Aviation also flies

2394-518: 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,

2520-399: A spacecraft to exceed the depth of the gravity potential energy well. Once this has occurred, provided the energy is not lost in any non-conservative way, then the vehicle will leave the influence of the Earth. The depth of the potential well depends on the vehicle's position, and the energy depends on the vehicle's speed. If the kinetic energy exceeds the potential energy then escape occurs. At

2646-458: A special operations force, Army Rangers are generally better equipped than standard infantry, utilizing the FN SCAR rifle. Army Special Forces , commonly known as Green Berets after their iconic headgear, are among the most elite soldiers in the Army. Special Forces conduct: Army Special Forces are trained in military free-fall parachuting and combat diver skillsets. They are considered

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2772-521: A study calling for its transfer to the Space Force. United States Armed Forces The United States Armed Forces are the military forces of the United States . The armed forces consist of six service branches : the Army , Marine Corps , Navy , Air Force , Space Force , and Coast Guard . All six armed services are among the eight uniformed services of the United States , along with

2898-463: A sub-orbital flight would be a ballistic missile, or future tourist flight such as Virgin Galactic , or an intercontinental transport flight like SpaceLiner . Any space launch without an orbit-optimization correction to achieve a stable orbit will result in a suborbital space flight, unless there is sufficient thrust to leave orbit completely (See Space gun#Getting to orbit ). In addition, if orbit

3024-438: Is about 3–6 g. Some launchers such as gun launchers would give accelerations in the hundred or thousands of g and thus are completely unsuitable. Launchers vary with respect to their reliability for achieving the mission. Safety is the probability of causing injury or loss of life. Unreliable launchers are not necessarily unsafe, whereas reliable launchers are usually, but not invariably safe. Apart from catastrophic failure of

3150-453: Is expected to get much worse. Some rocket manufacturers (i.e. Orbex , ArianeGroup ) are using different launch fuels (such as bio-propane; methane produced from biomass). Sub-orbital space flight is any space launch that reaches space without making a full orbit around the planet, and requires a maximum speed of around 1 km/s to reach space, and up to 7 km/s for longer distance such as an intercontinental space flight. An example of

3276-399: Is known as Model Predictive Control (MPC) . Many rockets use fossil fuels. A SpaceX Falcon Heavy rocket for instance burns through 400 metric tons of kerosene and emits more carbon dioxide in a few minutes than an average car would in more than two centuries. As the number of rocket launches is expected to increase heavily in the coming years, the effect that launching into orbit has on Earth

3402-461: Is necessary. This implies a minimum gravitational potential energy needs to be overcome: for the Kármán line; this is approximately 1 MJ/kg. W=mgh, m=1 kg, g=9.82 m/s , h=10 m. W=1*9.82*10 ≈10 J/kg=1MJ/kg In practice, a higher energy than this is needed to be expended due to losses such as airdrag, propulsive efficiency, cycle efficiency of engines that are employed and gravity drag . In

3528-477: Is often used for systems where computing the full closed-loop solution is not required, impractical or impossible. If a trajectory optimization problem can be solved at a rate given by the inverse of the Lipschitz constant , then it can be used iteratively to generate a closed-loop solution in the sense of Caratheodory . If only the first step of the trajectory is executed for an infinite-horizon problem, then this

3654-423: Is required, then a much greater amount of energy must be generated in order to give the craft some sideways speed. The speed that must be achieved depends on the altitude of the orbit – less speed is needed at high altitude. However, after allowing for the extra potential energy of being at higher altitudes, overall more energy is used reaching higher orbits than lower ones. The speed needed to maintain an orbit near

3780-621: Is unique in that it is a military branch specializing in maritime operations and also a law enforcement agency. The United States Army (USA) is the United States Armed Forces' land force and is the largest and oldest service. Originally established in 1775 as the Continental Army , it consists of one million soldiers across the Regular Army, Army Reserve , and Army National Guard . The Army serves as

3906-485: Is unique in that it specializes in maritime operations and is also a law enforcement agency. From their inception during the American Revolutionary War , the U.S. Armed Forces have played a decisive role in the country's history . They helped forge a sense of national unity and identity through victories in the early-19th-century First and Second Barbary Wars . They played a critical role in

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4032-723: The 10th Mountain Division , 11th Airborne Division , 25th Infantry Division , 82nd Airborne Division , 101st Airborne Division , and 173rd Airborne Brigade have a cavalry squadron equipped with the Joint Light Tactical Vehicle . The Field Artillery's mission is to destroy, suppress or neutralize the enemy by cannon, rocket or missile fire. Rocket systems include the M142 HIMARS and M270 multiple launch rocket system , which are corps-level assets found in field artillery brigades. Towed artillery includes

4158-523: The 11th Airborne Division , 82nd Airborne Division , and 173rd Airborne Brigade are capable of airborne operations, in cooperation with the U.S. Air Force's transport aircraft. Finally, Infantry Brigade Combat Teams assigned to the 10th Mountain Division specialize in mountain warfare . Standard Infantry Brigade Combat Teams are assigned to the 25th Infantry Division , which offers additional training in jungle warfare . Armored Brigade Combat Teams comprise mechanized infantry battalions mounted in

4284-400: The 4th Infantry Division . Each Armored Brigade Combat Team also possesses a cavalry squadron equipped with M2 Bradleys for scouting and security. Stryker Brigade Combat Teams from the 2nd Infantry Division , 4th Infantry Division , 11th Airborne Division , 2nd Cavalry Regiment , and 3rd Cavalry Regiment have a cavalry squadron equipped with Strykers . Infantry Brigade Combat Teams from

4410-524: The 75th Ranger Regiment are an elite special operations infantry force in the United States Army Special Operations Command , specializing in air assault and airborne infiltration methods. The three primary missions of the 75th Ranger Regiment are special operations raids , forcible entry operations, such as an airfield seizure to enable the Air Force to bring in more forces, and special reconnaissance . As

4536-580: 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

4662-497: 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

4788-748: The British Empire in the American Revolutionary War . These forces demobilized in 1784 after the Treaty of Paris ended the Revolutionary War. The Congress of the Confederation created the current United States Army on 3 June 1784. The United States Congress created the current United States Navy on 27 March 1794 and the current United States Marine Corps on 11 July 1798. All three services trace their origins to their respective Continental predecessors. The 1787 adoption of

4914-596: The Constitution gave Congress the power to "raise and support armies," to "provide and maintain a navy", and to "make rules for the government and regulation of the land and naval forces", as well as the power to declare war . The President of the United States is the United States Armed Forces' commander-in-chief . The United States Coast Guard traces its origin to the formation of the Revenue Cutter Service on 4 August 1790, which merged with

5040-626: The Department of Homeland Security responsible for administering the United States Coast Guard . The military chain of command flows from the President of the United States to the secretary of defense (for services under the Defense Department) or secretary of homeland security (for services under the Department of Homeland Security), ensuring civilian control of the military . Within the Department of Defense,

5166-454: The Department of the Air Force alongside the U.S. Air Force , its coequal sister service. The Department of 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

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5292-592: The Department of the Navy , which is a military department under the leadership of the secretary of the Navy and the under secretary of the Navy . The U.S. Marine Corps itself is led by the commandant of the Marine Corps and the assistant commandant of the Marine Corps , both generals who are advised by the sergeant major of the Marine Corps . The Marine Corps statutory mission is outlined in 10 U.S.C.   § 5063 and as originally introduced under

5418-452: 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

5544-690: The FIM-92 Stinger man-portable air-defense system , AN/TWQ-1 Avenger for short range air defense , and the counter rocket, artillery, and mortar 20mm gun system. The Iron Dome provides air defense against rockets, artillery, mortars, missiles, and unmanned aerial vehicles. The MIM-104 Patriot is capable of defeating a wide range of threats including aircraft, helicopters, UAVs, ballistic and cruise missiles, and Weapons of Mass Destruction. The Terminal High Altitude Area Defense protects strategic critical assets by conducting long-range endo-and-exo-atmospheric engagements of ballistic missiles using

5670-501: 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

5796-598: 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

5922-620: The M119 howitzer in infantry brigade combat teams and the M777 howitzer found in both infantry and Stryker brigade combat teams. The M109 self-propelled howitzer is utilized in armored brigade combat teams. During the Cold War, Army field artillery was responsible for the service's ballistic missile programs, including the PGM-11 Redstone , which was the first large ballistic missile in

6048-671: The M2 Bradley infantry fighting vehicle . Divisions with Armored Brigade Combat Teams include the 1st Infantry Division , 3rd Infantry Division , 4th Infantry Division , 1st Armored Division , and 1st Cavalry Division . Stryker Brigade Combat Teams are centered around Stryker infantry battalions operating out of the Stryker . Divisions with Stryker Brigade Combat Teams include the 2nd Infantry Division , 4th Infantry Division , 11th Airborne Division , 2nd Cavalry Regiment , and 3rd Cavalry Regiment . United States Army Rangers with

6174-712: The MQ-1C Gray Eagle drone. A specialized unit within Army Aviation, the 160th Special Operations Aviation Regiment (Airborne) serves as a special operations unit and operates modified variants of the MH-60 Black Hawk, MH-47 Chinook, and the MH-6 Little Bird . The U.S. Army is organized into four major Army Commands, nine Army Service Component Commands which serve as the Army component and joint force land component commanders for

6300-475: The Marine Corps Reserve . The Marine Corps maintains a very close relationship with the U.S. Navy, its sister service in the Department of the Navy. Although the Marine Corps has previously operated as an independent land force alongside the Army, its primary purpose is to serve as part of a unified naval service alongside the Navy in the maritime domain. The U.S. Marine Corps is organized under

6426-509: The National Security Act of 1947 , with its three primary areas of responsibility including: Space launch There is no clear boundary between Earth's atmosphere and space, as the density of the atmosphere gradually decreases as the altitude increases. There are several standard boundary designations, namely: In 2009, scientists reported detailed measurements with a Supra-Thermal Ion Imager (an instrument that measures

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6552-817: 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 the United States' dependence on space had increased, but comparatively little...[had] been achieved to make them more secure." It also noted, despite

6678-595: 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

6804-553: The U.S. Public Health Service Commissioned Corps and the NOAA Commissioned Officer Corps . Each of the different military services is assigned a role and domain. The Army conducts land operations. The Navy and Marine Corps conduct maritime operations, the Marine Corps specializing in amphibious and maritime littoral operations primarily for supporting the Navy. The Air Force conducts air operations. The Space Force conducts space operations. The Coast Guard

6930-787: The United States Life-Saving Service on 28 January 1915 to establish the Coast Guard. The United States Air Force was established as an independent service on 18 September 1947; it traces its origin to the formation of the Aeronautical Division, U.S. Signal Corps , which was formed 1 August 1907 and was part of the Army Air Forces before being recognized as an independent service in the National Security Act of 1947. The United States Public Health Service Commissioned Corps

7056-624: The Vietnam War and have participated in every U.S. military operation since, most notably in 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

7182-502: 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

7308-494: The homeland security advisor , and the deputy national security advisor may also be members of the United States Armed Forces. The National Security Council Deputies Committee also includes the deputy secretary of defense , deputy secretary of homeland security , and vice chairman of the Joint Chiefs of Staff . Military leadership, including the secretary of defense, the secretary of Homeland Security, and chairman of

7434-603: The joint force land component , Navy components are typically dual-hatted as the joint force maritime component , and Air Force components are typically dual-hatted as the joint force air component , with the theater special operations command dual-hatted as the joint force special operations component, and Space Force component typically dual-hatted as the joint force space component. Combat support agencies are Department of Defense agencies with combat support missions that service operating forces planning or conducting military operations. This includes support during conflict or in

7560-410: The sergeant major of the Army . The Army's primary responsibility is to conduct prompt and sustained land combat as part of the joint force. Army landpower focuses on destroying an enemy's armed forces, occupying its territory, and breaking the will of an adversary. The five core competencies of the Army are: The thirteen specified functions of the Army are: The Infantry Branch forms the core of

7686-584: The territorial evolution of the U.S. , including the American Civil War . The National Security Act of 1947 created the modern U.S. military framework, establishing the National Military Establishment (later the Department of Defense or DoD) headed by the secretary of defense and creating both the U.S. Air Force and National Security Council ; in 1949, an amendment to the act merged the cabinet-level departments of

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7812-541: The unified combatant commands , and thirteen direct reporting units. The United States Marine Corps (USMC) serves as the U.S. Armed Forces' naval land force, responsible for executing amphibious warfare and operating in the maritime littorals in support of the U.S. Navy. Originally established in 1775 as the Continental Marines , the Marine Corps consists of the Regular Marine Corps and

7938-764: 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

8064-506: 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

8190-491: The Air Force through its Air and Missile Defense Commands and the Space Force through Army Space and Missile Defense Command, given their shared missile defense and space roles. In 1962, Air Defense Artillery achieved the first intercept of a ballistic missile with a nuclear-tipped Nike Zeus and operated the Nike Zeus as an anti-satellite weapon after completing a successful intercept in 1963. Army Aviation, distinct from

8316-567: 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

8442-498: 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

8568-477: The Armed Forces principal land service, responsible for conducting land warfare operations. The U.S. Army is organized under the Department of the Army , which is a military department under the leadership of the secretary of the Army and under secretary of the Army . The U.S. Army itself is led by the chief of staff of the Army and vice chief of staff of the Army , both generals who are advised by

8694-494: The Army , commandant of the Marine Corps , chief of naval operations , chief of staff of the Air Force , chief of space operations , and the chief of the National Guard Bureau . The commandant of the Coast Guard is not an official member of the Joint Chiefs, but sometimes attends meetings as one of the military service chiefs. The senior enlisted advisor to the chairman is the most senior enlisted member in

8820-489: 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

8946-492: The Army, Navy, and Air Force into the DoD. The president of the U.S. is the commander-in-chief of the armed forces and forms military policy with the DoD and Department of Homeland Security (DHS), both federal executive departments , acting as the principal organs by which military policy is carried out. The U.S. Armed Forces are one of the world's largest military forces in terms of personnel. They draw their personnel from

9072-526: 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

9198-572: The Department of Defense's military departments. The United States Coast Guard is nominally under the Department of Homeland Security , but may be transferred to the Department of Defense's Department of the Navy (which is the civilian entity that oversees the coequal U.S. Marine Corps and U.S. Navy) at the direction of the President or Congress. With the exception of the Coast Guard, the military services only organize, train, and equip forces. The unified combatant commands are responsible for operational control of non-service retained forces. Each of

9324-492: 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 the Secretary of Defense to conduct

9450-490: 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

9576-631: 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

9702-445: The Earth's surface corresponds to a sideways speed of about 7.8 km/s (17,400 mph), an energy of about 30MJ/kg. This is several times the energy per kg of practical rocket propellant mixes. Gaining the kinetic energy is awkward as the airdrag tends to slow the spacecraft, so rocket-powered spacecraft generally fly a compromise trajectory that leaves the thickest part of the atmosphere very early on, and then fly on for example,

9828-436: The Earth's surface this occurs at a speed of 11.2 km/s (25,000 mph), but in practice a much higher speed is needed due to airdrag. Non-rocket spacelaunch refers to theoretical concepts for launch into space where much of the speed and altitude needed to achieve orbit is provided by a propulsion technique that is not subject to the limits of the rocket equation . Although all space launches to date have been rockets,

9954-736: The Joint Chiefs of Staff also sit on the National Space Council . Unified combatant commands are joint military commands consisting of forces from multiple military departments, with their chain of command flowing from the president, to the secretary of defense, to the commanders of the combatant commands. Each service organizes, trains, and equips forces that are then presented to the unified combatant commands through service component commands. Special Operations Command and Cyber Command also present theater special operations commands or joint force headquarters – cyber to other combatant commanders. Army components are typically dual-hatted as

10080-632: 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

10206-521: 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

10332-454: 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

10458-417: 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 the Space Force establish control of

10584-498: 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 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

10710-549: 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

10836-568: The Strategic Defense Initiative. Congress began exploring establishing 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

10962-442: The U.S. The U.S. Air Force is the world's largest air force, followed by the U.S. Army Aviation Branch . The U.S. Naval Air Forces is the fourth-largest air arm in the world and is the largest naval aviation service, while U.S. Marine Corps Aviation is the world's seventh-largest air arm. The U.S. Navy is the world's largest navy by tonnage . The U.S. Coast Guard is the world's 12th-largest maritime force. The history of

11088-489: The U.S. Air Force and its predecessors, began as part of the field artillery in 1942. Small spotter planes were used to spot for artillery and naval bombardment, as well as to perform observation. These few aircraft formed the core of Army Aviation once the U.S. Air Force gained independence. In 1983, the Army created the Aviation Branch, for the first time since the Air Force's independence consolidating aviation under

11214-555: The U.S. Armed Forces dates back to 14 June 1775, with the creation of the Continental Army , even before the Declaration of Independence marked the establishment of the United States. The Continental Navy , established on 13 October 1775, and Continental Marines , established on 10 November 1775, were created in close succession by the Second Continental Congress in order to defend the new nation against

11340-677: The U.S. Armed Forces is established in Article II in the Constitution whereby the president is named as the " Commander in Chief of the Army and Navy of the United States, and of the Militia of the several States, when called into the actual Service of the United States." The United States Armed Forces are split between two cabinet departments, with the Department of Defense serving as the primary cabinet department for military affairs and

11466-400: 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

11592-733: The U.S. arsenal, the MGM-31 Pershing , and the Pershing II . In 2023, the Army is intending to field the Long-Range Hypersonic Weapon and has reestablished larger artillery formations like the 56th Artillery Command . The Air Defense Artillery is responsible for defending geopolitical assets and providing maneuver forces with the freedom to move on the battlefield by deterring the enemy and destroying aerial threats, missile attacks, and surveillance platforms. Weapons employed by Air Defense Artillery include

11718-551: The U.S. military and the first new branch in 72 years. The origin of the Space Force can be traced back to the Air Force Space Command , which was formed 1 September 1982 and was a major command of the United States Air Force. The U.S. Congressional Research Office annually publishes a List of Notable Deployments of U.S. Military Forces Overseas since 1798. Presidential command over

11844-404: The U.S. was US$ 916 billion in 2023, the highest in the world, accounting for 37% of the world's defense expenditures . The U.S. Armed Forces has significant capabilities in both defense and power projection due to its large budget, resulting in advanced and powerful technologies which enable widespread deployment of the force around the world, including around 800 military bases outside

11970-502: The United States Armed Forces. Leadership of the Armed Forces, to include the president of the United States, the secretary of defense , the secretary of Homeland Security and chairman of the Joint Chiefs of Staff are members of the United States National Security Council , which advises the president on national security, military, and foreign policy matters. The national security advisor ,

12096-677: The conduct of other military activities related to countering threats to U.S. national security. This mission is focused on providing support to echelons at the CCMD level and below and may not encompass the full scope of the CSA's mission. The United States Armed Forces is composed of six coequal military service branches. Five of the branches, the United States Army , United States Marine Corps , United States Navy , United States Air Force , and United States Space Force , are organized under

12222-401: The different military services is assigned a role and domain. The U.S. Army conducts land operations, while the U.S. Navy and U.S. Marine Corps conduct maritime operations, with the Marine Corps specializing in amphibious and maritime littoral operations in support of the Navy. The U.S. Air Force conducts air operations, while the U.S. Space Force conducts space operations. The U.S. Coast Guard

12348-447: The direction and speed of ions), which allowed them to establish a boundary at 118 km (73.3 mi) above Earth. The boundary represents the midpoint of a gradual transition over tens of kilometers from the relatively gentle winds of the Earth's atmosphere to the more violent flows of charged particles in space, which can reach speeds well over 268 m/s (880 ft/s). By definition for spaceflight to occur, sufficient altitude

12474-467: 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

12600-430: 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

12726-453: 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

12852-645: 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

12978-513: 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

13104-481: 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

13230-651: 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

13356-526: The launch vehicle itself, other safety hazards include depressurisation, and the Van Allen radiation belts which preclude orbits which spend long periods within them. Trajectory optimization is the process of designing a trajectory that minimizes (or maximizes) some measure of performance while satisfying a set of constraints. Generally speaking, trajectory optimization is a technique for computing an open-loop solution to an optimal control problem. It

13482-401: 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

13608-506: 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

13734-471: The military departments ( Department of the Army , United States Department of the Navy , and Department of the Air Force ) are civilian led entities that oversee the coequal military service branches organized within each department. The military departments and services are responsible for organizing, training, and equipping forces, with the actual chain of command flowing through the unified combatant commands . The Joint Chiefs of Staff , although outside

13860-685: The most versatile special operations force in the entire world, operating as a multi-purpose force since 1952. The Armor Branch traces its history back to the United States Cavalry and are responsible for tank and cavalry reconnaissance operations. The U.S. Army fields the M1 Abrams main battle tank in Armored Battalions as part of Armored Brigade Combat Teams across the 1st Armored Division , 1st Cavalry Division , 1st Infantry Division , 3rd Infantry Division , and

13986-400: The operational chain of command, is the senior-most military body in the United States Armed Forces. It is led by the chairman of the Joint Chiefs of Staff , who is the military head of the armed forces and principal advisor to the president and secretary of defense on military matters. Their deputy is the vice chairman of the Joint Chiefs of Staff . Other members include the chief of staff of

14112-450: The past fifty years, spaceflight has usually meant remaining in space for a period of time, rather than going up and immediately falling back to earth. This entails orbit, which is mostly a matter of velocity, not altitude, although that does not mean air friction and relevant altitudes in relation to that, and orbit, do not need to be considered. At much higher altitudes than many orbital ones maintained by satellites, altitude begins to become

14238-412: 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 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

14364-454: 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 the Air Force, however it experienced significant opposition from the Air Force and Defense Department, failing in the Senate. However, the proposal

14490-577: 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

14616-453: 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

14742-780: The service's land combat power. U.S. Army infantry are generally equipped with the M4 carbine and M249 light machine gun , which will be replaced by the XM7 rifle and XM250 . Infantry is a core part of the Army's Brigade Combat Teams . The most numerous variant, the Infantry Brigade Combat Team, comprises light infantry battalions who fight on foot. Infantry Brigade Combat Teams of the 82nd Airborne Division are air assault capable, with infantry soldiers being transported by U.S. Army Aviation UH-60 Black Hawk and CH-47 Chinook helicopters. Infantry Brigade Combat Teams of

14868-518: 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

14994-536: 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

15120-506: The world's largest air-transportable X-band radar. The Ground-Based Midcourse Defense is an anti-ballistic missile system operated by Army Space and Missile Defense Command to defend the United States homeland against an intercontinental ballistic missile attack. Major Air Defense Artillery units include the 32nd Army Air and Missile Defense Command and Army Space and Missile Defense Command's 100th Missile Defense Brigade . Air Defense Artillery has an extremely close relationship with

15246-601: 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

15372-437: 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

15498-405: Was formerly considered to be a branch of the United States Armed Forces from 29 July 1945 until 3 July 1952, and is now one of the eight uniformed services of the United States. Should it be called into active duty again, it would constitute a seventh branch of the Armed Forces. The United States Space Force was established as an independent service on 20 December 2019. It is the sixth branch of

15624-485: 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

15750-575: 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,

15876-494: 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 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

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