Orbital Defense

Earth orbit was militarized from day one — Sputnik was a Cold War signal, Corona was the first spy satellite, GPS was built for precision-guided munitions. What changed is that orbit is now being weaponized: nations are deploying systems designed to deny, degrade, or destroy other nations' space assets.

US Space Force budget (FY2026)
$29.4B requested
Golden Dome
$175B+ space-based missile defense
SDA PWSA (on orbit)
60+ Tranche 1 transport layer
ASAT debris (still on orbit)
2,773 pieces from 4 nations' tests
Counterspace nations
US, China, Russia + India, France, UK, Japan
Confidence
Observed

The landscape

Military Use of Earth Orbit: From Reconnaissance to Contested Domain

Space was militarized in 1957. It is being weaponized now.

Military use of orbit is as old as the space age itself. The distinction that matters is between militarization (using space for military support — reconnaissance, communications, navigation, missile warning) and weaponization (deploying systems in space designed to attack targets in space or on Earth). Orbit has been militarized since the Corona reconnaissance satellites of the 1960s. GPS, SBIRS missile warning, Milstar/AEHF communications, and the NRO’s imaging constellation are all military assets in Earth orbit that have operated for decades without controversy.

What changed is that three nations — the United States, China, and Russia — are now actively developing, testing, and in some cases deploying systems designed to deny, degrade, or destroy other nations’ space assets. The Secure World Foundation’s 2026 Global Counterspace Capabilities Report documents this shift in detail: ASAT tests by four nations have created 6,904 cataloged pieces of debris, of which 2,773 remain in orbit. The report notes a proliferation of R&D into counterspace capabilities, with an increase in “bodyguard” satellites and spaceplanes that have inherent co-orbital ASAT capability.

US military space

US Space Force and the Proliferated Warfighter Space Architecture

A LEO mesh of hundreds of satellites that tracks missiles and routes targeting data.

The Space Development Agency (SDA), a US Space Force organization created in 2019, is building the Proliferated Warfighter Space Architecture (PWSA) — a large LEO constellation of satellites organized in two layers. The Transport Layer is a mesh network of satellites with Link 16 tactical data terminals and optical inter-satellite links that relay data between spacecraft, ground stations, ships, and aircraft. The Tracking Layer carries infrared sensors for missile warning, missile tracking, and fire-control-quality target data.

Tranche 1 (initial warfighting capability): 154 operational satellites — 126 transport layer and 28 tracking layer. As of July 2026, more than 60 Tranche 1 transport satellites are on orbit; tracking satellites are being checked out. Contractors: Lockheed Martin, Northrop Grumman, L3Harris, York Space Systems.

Tranche 2: 270 satellites (transport + tracking). Post-critical design review, preparing for assembly and integration. Launches targeted late 2026. On “strategic pause” for some elements as the Pentagon reviews acquisition options.

Tranche 3: $3.5 billion awarded in December 2025 to four companies (Lockheed Martin $1.1B, L3Harris $843M, Rocket Lab $805M, Northrop Grumman $784M) for 72 tracking layer satellites. Half the constellation will carry payloads for fire-control-quality missile defense tracks. Launches targeted FY2029. Near-continuous global missile warning and tracking coverage.

Beyond the PWSA, the US military operates legacy constellations for missile warning (SBIRS in GEO/HEO, to be replaced by the Next-Gen Overhead Persistent Infrared system), secure communications (AEHF in GEO, WGS), GPS navigation, and the classified NRO reconnaissance fleet. The X-37B robotic spaceplane conducts long-duration classified missions in LEO (its seventh mission is in progress as of 2026). The Space Force also fields the CCS (Counter Communications System), a ground-based satellite jammer, and is deploying two new systems — Meadowlands and RMT — for jamming adversary reconnaissance satellites.

Starshield. SpaceX’s government-focused variant of Starlink, operated as a separate classified network with high-assurance encryption and the ability to host classified payloads. The NRO’s MILNET Block I has approximately 200 satellites, including Starshields, for communications and space-based ground moving target indication (GMTI). The PLEO (Proliferated LEO) program ceiling grew from $900 million to $13 billion — a signal that the Pentagon views Starshield as critical infrastructure. SpaceX holds $22 billion in cumulative federal contracts across NASA, the Space Force, NRO, and SDA, with $3.3 billion in unclassified government revenue in 2024 alone. As of mid-2026, SpaceX holds approximately $6.45 billion in Golden Dome-related contracts alone (see below), plus $739 million to launch 44 SDA Tranche 2 tracking layer satellites, and roughly 12 NRO launches planned for 2026 on Falcon 9 and Falcon Heavy.

Golden Dome

Golden Dome for America: Space-Based Missile Defense

Space-based interceptors that shoot down missiles in flight. SDI reborn, at lower launch costs.

Announced by President Trump in May 2025, Golden Dome is a proposed multi-layer missile defense system designed to protect the US homeland from ballistic, hypersonic, and cruise missile threats. The space-based component consists of a proliferated LEO constellation carrying kinetic interceptors that destroy missiles during boost, midcourse, and glide phases. General Michael Guetlein, US Space Force, leads the program.

Scale and cost: The White House projected $175 billion; the Pentagon requested $17.5 billion in FY2027 for Golden Dome ($185 billion total as of the March 2026 revision). As of August 2026, Congress has not appropriated the full amount, and program leadership warned the program may halt development as early as October 2026 without additional funding.

SpaceX contracts ($6.45 billion). In late May 2026, SpaceX won two contracts that together make it the dominant contractor in Golden Dome’s space layer. First: $4.16 billion for the Space-Based Airborne Moving Target Indicator (SB-AMTI) — a constellation of satellites that detect, track, and target airborne threats (missiles, aircraft) from orbit using space-based sensors, secure optical ISLs, and AI-enabled ground processing. The system eliminates the blind spots that ground-based radar and airborne surveillance cannot cover. Constellation targeted for initial fielding by 2028. Second: $2.29 billion for the Space Data Network (SDN) Backbone (formerly MILNET) — a proliferated LEO constellation of Starshield satellites functioning as a secure, high-capacity military data transport mesh. Fully operational prototype by end of 2027. Combined, SpaceX holds more Golden Dome contract value than every other company in the program combined.

Other Golden Dome contractors. 12 companies received $3.2 billion in space-based interceptor (SBI) prototype OTA agreements (awarded late 2025 / early 2026), with integration into the Golden Dome architecture targeted by 2028. Ground tests before year-end 2026. 2,440 vendors approved, including Northrop Grumman, Lockheed Martin, Raytheon, L3Harris, Anduril ($5B raise at $61B valuation), Palantir, and True Anomaly ($650M raise after SBI selection). The Space Force awarded Rocket Lab $266 million for 12 suborbital test missions, and SpaceX $1.6 billion for 18 launches of communications and targeting satellites by end of 2027.

The SDI parallel. Golden Dome explicitly echoes Reagan’s Strategic Defense Initiative (1983), which proposed space-based missile defense and was abandoned due to cost, technical barriers, and political resistance. The Brilliant Pebbles variant — proliferated small autonomous heat-seeking interceptor satellites — was estimated to save $7–$13 billion over the Phase I architecture but was canceled in 1994. Golden Dome enters the same problem with lower launch costs, reusable vehicles, mass-produced LEO spacecraft, modern IR sensors, optical ISLs, and AI-enabled fire control. The fundamental cost-exchange problem remains: a single attacking missile can force the defender to deploy many orbital interceptors to ensure one is in position at launch.

The dual-use problem. As noted in Henry Sokolski’s 2025 book Golden Dome: What’s Its Story? and the Secure World Foundation’s 2026 report, any space-based kinetic interceptor has inherent ASAT capability. A satellite designed to hit a missile at Mach 20 can also hit a satellite. Golden Dome, if built, is simultaneously a missile defense system and the largest orbital weapons constellation ever deployed.

Counterspace weapons

Anti-Satellite and Counterspace Capabilities by Type

Five ways to kill a satellite, ranked by reversibility.

Electronic warfare (non-destructive). Ground-based or airborne jammers that deny, degrade, or spoof satellite signals. The US CCS jams adversary satellite communications. Russia has attempted to jam Starlink during the Ukraine conflict. China and Russia both possess EW systems targeting GPS, SATCOM, and ISR links. This is the most-used counterspace capability in active military conflicts.

Cyber operations (non-destructive). Attacks on satellite ground infrastructure, command-and-control networks, and data links. The 2026 Secure World Foundation report documented major breaches of ESA computer systems and noted that many GEO communications satellites transmit data without encryption. Cyber is now a standard component of Russian military operations against Ukrainian space-enabled capabilities.

Directed energy (non-destructive to destructive). Lasers that dazzle or blind satellite optical sensors. France and Germany have both expressed interest in laser-based non-destructive ASAT capabilities. China has been assessed to possess ground-based laser systems capable of dazzling or damaging satellites in LEO.

Co-orbital / rendezvous and proximity operations (RPO). Satellites that maneuver close to other satellites to inspect, shadow, interfere with, or physically disable them. China has demonstrated satellite capture and relocation to graveyard orbit. Russia’s Luch satellite traveled the GEO belt for years, parking near Western communications satellites. The US conducts RPO with the X-37B and other classified platforms. The UK and France both conducted cooperative RPO with the US in 2025.

Direct-ascent ASAT (destructive). A missile launched from the ground or air that physically destroys a satellite through kinetic impact. China tested a DA-ASAT in 2007 (creating 2,700+ tracked debris pieces still in orbit). Russia tested its Nudol DA-ASAT in November 2021 against a defunct Soviet satellite (1,500 tracked debris, tens of thousands smaller). India tested a DA-ASAT in 2019. The US tested an SM-3 against a defunct satellite in 2008. All four tests created long-lived debris. Russia is assessed to have an air-launched ASAT (Burevestnik, carried by MiG-31). China has a ground-based operational DA-ASAT system that the PLA actively trains on, assessed to target LEO, with a potential capability reaching GEO (a 2013 ballistic launch peaked at 30,000 km).

Nuclear (catastrophic). Russia has reportedly worked on an orbital nuclear warhead that could destroy satellites across a wide area via EMP and radiation. This is the most extreme counterspace capability and the one least constrained by precision — a nuclear detonation in LEO would damage satellites indiscriminately across all nations.

China

Chinese Military Space and Counterspace Programs

The broadest range of known ASAT capabilities of any nation.

The DIA assesses that the PLA is building an offensive counterspace posture designed to deter, coerce, and fight while limiting escalation. China’s arsenal combines soft-kill systems — satellite jammers, cyber capabilities, directed-energy weapons, laser dazzling, data link attacks — with hard-kill options including an operational ground-based DA-ASAT system targeting LEO and a probable capability to reach GEO. The PLA actively trains on these systems.

China has demonstrated satellite “inspection and repair” systems that function as co-orbital weapons — including a satellite that captured another satellite and relocated it to graveyard orbit. A likely on-orbit refueling experiment conducted through the second half of 2025 is documented in the Secure World Foundation report. Beijing and Moscow are studying how to counter proliferated LEO constellations like Starlink, which has proven critical to Ukraine’s defense communications.

China operates its own military satellite constellation for reconnaissance (Yaogan series), missile warning, communications, and navigation (BeiDou). The Jilin-1 commercial imaging constellation has documented dual-use intelligence collection on US military operations (see Orbital Imaging). A July 2026 investigation by The Insider, Der Spiegel, and Le Monde documented structured China-Russia cooperation across counterspace operations, integrated air and missile defense, autonomous weapons, and military aviation.

Russia

Russian Military Space and Counterspace Programs

Operational EW experience from Ukraine; destructive ASAT tests; an orbital nuclear threat.

Russia has the most operational experience using counterspace capabilities in active combat, drawn from the Ukraine conflict. Russian forces have attempted to jam Starlink, GPS, and SATCOM links throughout the war. Russia’s Nudol DA-ASAT test (November 2021) created 1,500 tracked debris pieces and endangered the ISS and Tiangong. The Luch satellite conducted years-long proximity operations near Western GEO communications satellites. In 2020, a Russian satellite ejected an object near another Russian satellite — assessed as a test of a space-based ASAT weapon.

Russia is reported to be developing an orbital nuclear warhead for EMP-based satellite destruction. Russia’s primary advantage over the US is in this area: no Western nation has an equivalent capability. Russia’s primary disadvantage is industrial capacity — its ability to produce and launch satellites at the scale of the PWSA or Starlink is limited compared to both the US and China.

Commercial in the kill chain

Commercial Space Infrastructure in Military Operations

The military depends on commercial space. That makes commercial space a target.

The US military is increasingly dependent on commercial satellite infrastructure for communications (Starlink, SES), imagery (Planet, Vantor, BlackSky, ICEYE — see Orbital Imaging), launch (SpaceX, ULA, Rocket Lab), and data relay. The NRO’s EOCL and RCA programs purchase imagery directly from commercial operators. The SDA’s PWSA uses commercial satellite buses. Tactically responsive space missions (VICTUS HAZE, launched June 2026 on a Rocket Lab Electron from New Zealand) demonstrate rapid-response military launch from commercial providers.

This integration means commercial satellites are in the kill chain — their data feeds targeting systems that guide weapons. That makes them legitimate military targets under the laws of armed conflict, even though they serve civilian customers simultaneously. The dual-use problem runs in both directions: commercial providers gain military revenue, but their constellations inherit military risk.