SpaceX just landed one of the largest military satellite contracts ever awarded to a single company. The US Space Force signed a $2.29 billion firm-fixed-price agreement for what it calls the Space Data Network Backbone, a constellation of satellites in low Earth orbit built to shuttle sensitive military data at high speed using advanced encryption and inter-satellite laser communications.
The contract, structured as an Other Transaction Authority (OTA) agreement, requires SpaceX to deliver a fully operational prototype by the end of 2027.
What SpaceX is actually building
The system builds directly on SpaceX’s Starshield division, which adapts commercial Starlink technology for national security applications. The laser inter-satellite links are particularly notable. Traditional military satellite networks often rely on ground relay stations to pass data between orbiting assets, which creates single points of failure. Laser crosslinks allow satellites to communicate directly with each other in space, reducing latency and eliminating the need to bounce signals back to Earth just to route them to the next node.
SpaceX had already been demonstrating this capability through a smaller $57 million crosslink demonstration contract awarded in April 2026. The SDN Backbone contract essentially scales that proof of concept into a full operational system.
The Pentagon’s growing SpaceX dependency
The company previously secured a $1.8 billion contract with the National Reconnaissance Office for a constellation of spy relay satellites. Combined with the new SDN award, SpaceX now holds well over $4 billion in major military satellite contracts.
The SDN program aligns with the Space Force’s MILNET vision, which envisions hybrid mesh networks integrating both commercial and government satellite assets.
The bigger risk to monitor is concentration. The Pentagon is placing enormous bets on a single company. If SpaceX hits delivery milestones on the SDN prototype by late 2027, expect the contract pipeline to accelerate further.