SpaceX has secured a major defense contract from the US Space Force to develop a new military communications network in space.
The contract is valued at $2.29 billion and focuses on building the Space Data Network Backbone.
The project was previously known as MILNET before being renamed by military officials. It is designed to move military data via satellites in orbit rather than relying primarily on ground stations and terrestrial communication systems.
The new network will use satellites linked together with optical laser communication systems. These laser links enable satellites to transmit large amounts of data quickly and securely over long distances in space.
The Space Force said the system will act as the backhaul layer of a larger military communications architecture. In simple terms, it will serve as the primary transport network for data between sensors, spacecraft, command systems, and military units.
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Military officials want the system to support near real-time communication during operations. Faster data sharing is considered critical for modern warfare, especially in missile defense and space-based monitoring missions.
Starshield Satellites Pentagon Expansion
SpaceX plans to build the network using its Starshield satellites, which are based on the company’s commercial Starlink system. Starshield is designed specifically for government and national security operations.
According to SpaceX, the satellites provide secure communications and support military missions in orbit. The company has already expanded its work with US defense agencies through satellite launches and secure connectivity projects.
The Space Force said the new SDN Backbone will work together with the Space Development Agency’s Transport Layer constellation. That separate network already includes more than 300 low Earth orbit satellites ordered under earlier military contracts.
The Transport Layer system was developed through contracts shared among several defense companies. However, the Pentagon changed direction before beginning its next procurement phase and shifted its focus more toward the broader Space Data Network effort.
That decision raised concerns in the defense industry because a larger portion of future contracts is now centered around SpaceX. Earlier satellite programs spread work across multiple companies, while the SDN backbone gives SpaceX a much stronger position.
Despite those concerns, the Space Force said more companies are expected to join the larger SDN architecture over time. Officials also announced the creation of an SDN consortium to help different vendors maintain compatibility and common standards.
The contract was awarded through an Other Transaction Authority agreement, also known as an OTA. This process is commonly used by the Pentagon for rapid development programs because it enables faster contracting and testing than traditional defense procurement systems.
The Space Force said SpaceX must deliver a fully operational prototype by the end of 2027. The timeline reflects the Pentagon’s growing urgency to strengthen military communications in space.
Golden Dome Drives Demand
The Space Data Network has become closely connected to the Pentagon’s Golden Dome missile defense initiative. The program is designed to detect, track, and intercept advanced missile threats using a combination of satellites, communications systems, and interceptor technologies.
Military planners believe fast and secure data movement will be essential for future missile defense operations. A satellite detecting a missile launch could immediately send tracking information via the SDN network to defense systems or combat units worldwide.
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Defense officials describe this process as ‘sensor-to-shooter’ connectivity. The goal is to reduce delays between detection and response during military operations.
Gen. Michael Guetlein, who oversees the Golden Dome initiative, recently said the program’s budget was increased by $10 billion. Part of that funding will support the development of the new space-based communications network.
The Trump administration’s proposed fiscal year 2027 budget also includes major funding for the project. Budget documents show nearly $1.5 billion has been requested for research and development of the SDN backbone.
Another $2.38 billion has been requested for procurement and expansion of the broader low Earth orbit satellite constellation. The funding also covers supporting ground infrastructure needed to operate the system globally.
The project highlights how military space operations are becoming more dependent on commercial satellite technology. Companies like SpaceX are now playing a larger role in building communications systems that were once managed mainly by traditional defense contractors.
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The growing use of satellite mesh networks reflects wider changes in modern warfare and defense strategy. Faster communications, global connectivity, and rapid data sharing are becoming central requirements for future military operations.
If completed on schedule, the Space Data Network Backbone will become one of the largest military communications systems ever built in low Earth orbit. The program is expected to shape how the US manages military data, missile defense, and secure space operations in the years ahead.
