The U.S. Space Development Agency (SDA) has announced two major contract awards worth approximately $1.75 billion to accelerate the deployment of next-generation missile warning, missile tracking, and missile defense satellites under the Proliferated Warfighter Space Architecture (PWSA). The contracts, announced on July 13, 2026, will fund the construction of 36 Accelerated Missile Defense Tranche 3 (AMDT3) satellites, strengthening the U.S. Space Force's space-based missile defense capabilities while supporting the broader Golden Dome for America initiative.
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Major Investment in Space-Based Missile Defense
The latest acquisition reflects the Department of Defense's continued investment in building a resilient, distributed missile defense architecture capable of countering increasingly sophisticated threats, including hypersonic weapons and advanced ballistic missiles.
The new satellites represent another significant milestone in the rapid expansion of the Tracking Layer, one of the core components of the PWSA. Designed to detect, identify, track, and support the interception of advanced missile threats, the constellation will enhance both homeland defense and global military operations by providing persistent space-based surveillance from low Earth orbit.
Rather than relying on a small number of large satellites operating in higher orbits, the Space Development Agency continues to pursue a proliferated architecture consisting of hundreds of interconnected satellites operating in low Earth orbit. This approach increases resilience, improves global coverage, reduces vulnerability to attack, and allows the constellation to deliver continuous tracking information to military commanders.
The newly awarded AMDT3 satellites will expand this architecture by introducing additional missile warning and missile defense sensors while maintaining compatibility with existing Tracking Layer satellites already under development.
Overview of the Contract Awards
The procurement consists of two separate agreements that collectively fund the production of 36 satellites distributed across four orbital planes. The satellites will include both missile warning/missile tracking spacecraft and specialized missile defense variants capable of supporting advanced interception missions.
| Contract Award | Company | Contract Value | Satellites | Mission |
|---|---|---|---|---|
| Missile Defense Variant | L3Harris Technologies | Approximately $955 Million | 18 Satellites | Hypersonic & Ballistic Tracking Space Sensor (HBTSS)-like capability |
| Missile Warning & Tracking Variant | Sierra Space Corporation | Approximately $798 Million | 18 Satellites | Missile Warning and Missile Tracking |
Together, these contracts will provide the Space Force with an expanded constellation capable of improving global missile detection, tracking, and engagement support across multiple operational theaters.
Supporting the Golden Dome for America Initiative
The Accelerated Missile Defense Tranche 3 program forms an important component of the Golden Dome for America initiative, a broader national effort to strengthen the United States' integrated missile defense capabilities.
Golden Dome seeks to combine advanced sensors, command-and-control systems, interceptors, and space-based assets into a comprehensive defensive architecture capable of detecting and responding to increasingly complex missile threats.
Within this framework, the new Tracking Layer satellites will provide persistent infrared surveillance capable of identifying missile launches shortly after liftoff and continuously tracking them throughout flight. This information can then be shared with military commanders and missile defense systems responsible for responding to potential threats.
Expanding the Tracking Layer Constellation
The Tracking Layer is one of the most critical elements of the Proliferated Warfighter Space Architecture. Equipped with advanced infrared sensors, its satellites continuously monitor the Earth for missile launches, allowing military operators to detect ballistic, hypersonic, and other advanced missile threats as early as possible.
The addition of 36 new AMDT3 satellites significantly expands this capability by increasing global coverage and improving access to persistent tracking information.
Unlike earlier missile warning architectures that depended on a relatively limited number of large satellites, the proliferated Tracking Layer distributes sensing capabilities across numerous spacecraft operating in multiple orbital planes. This approach improves resilience while reducing the operational impact if individual satellites become unavailable.
Enhancing Detection of Advanced Missile Threats
One of the primary objectives of the AMDT3 program is improving the detection and tracking of modern missile threats that are more maneuverable and difficult to monitor than traditional ballistic missiles.
Hypersonic weapons, for example, travel at extremely high speeds while maneuvering unpredictably during flight, making them significantly more challenging to track using legacy systems.
The missile defense variants produced by L3Harris will incorporate capabilities similar to the Hypersonic and Ballistic Tracking Space Sensor (HBTSS), allowing the constellation to maintain continuous custody of fast-moving targets throughout their flight paths.
Maintaining uninterrupted tracking data improves the effectiveness of missile defense systems by providing interceptors with accurate targeting information during every phase of an engagement.
Interoperability Across Multiple Tranches
A major advantage of the Accelerated Missile Defense Tranche 3 satellites is their ability to operate seamlessly alongside satellites already deployed or currently under development.
Each spacecraft will be fully interoperable with satellites from Tranche 1, Tranche 2, and the broader Tranche 3 architecture.
All satellites will connect through a common ground system, allowing mission data to be shared rapidly across the entire constellation. This integrated architecture enables commanders to access information from multiple satellites simultaneously, improving overall situational awareness while reducing delays in operational decision-making.
Delivering Data Directly to Warfighters
Beyond simply detecting missile launches, the Tracking Layer is designed to rapidly distribute operational data directly to military forces.
Using low-latency communications and tactical data links, satellites can transmit missile warning and tracking information to commanders, air defense systems, and joint force units operating around the globe.
This rapid dissemination of information shortens response times while enabling military leaders to coordinate defensive actions more effectively.
The ability to provide near real-time tracking information represents a significant advancement over traditional architectures that often required additional processing before data reached operational users.
Launch Timeline and Future Operations
According to the Space Development Agency, all 36 AMDT3 satellites are expected to be ready for launch by the end of 2028.
Once deployed, operational responsibility for the constellation will transition to the U.S. Space Force, which will oversee mission operations, sustainment, and long-term integration with the nation's broader missile warning and missile defense enterprise.
The satellites will become part of the Space Force's evolving hybrid missile defense architecture, supporting homeland defense while providing critical capabilities to combatant commanders worldwide.
Strengthening the Future of Missile Defense
The $1.75 billion AMDT3 procurement demonstrates the Space Force's continued commitment to rapidly expanding resilient space-based missile defense capabilities. By combining distributed satellite constellations, advanced infrared sensing technologies, and integrated command-and-control systems, the Tracking Layer is becoming one of the most important components of America's future missile defense architecture.
As missile threats continue to evolve, the deployment of additional Tranche 3 satellites will improve global surveillance, strengthen deterrence, and enhance the Joint Force's ability to detect, track, and respond to emerging threats. Through partnerships with industry leaders such as L3Harris Technologies and Sierra Space, the Space Development Agency is accelerating the delivery of next-generation capabilities that will help protect the United States, allied nations, and deployed military forces well into the future.
Source: Space Development Agency
