The Space Force today announced it has awarded SpaceX $2.29 billion to “accelerate” fielding of a low Earth orbit (LEO) data-transport constellation that will serve as the backbone for the service’s planned Space Data Network, the service said in a Space Systems Command press release.
SpaceX award and schedule under Other Transaction Authority
The contract is an Other Transaction Authority agreement under which SpaceX is to deliver “a fully operational prototype capability by the end of 2027,” Space Systems Command (SSC) said. The value announced — $2.29 billion — was described in the SSC release as intended to “accelerate” fielding of what the service calls the SDN Backbone.
The SDN Backbone (formerly MILNET) and Starshield
The SDN Backbone, formerly known as MILNET, is based on SpaceX’s Starshield militarized variant of its commercial Starlink constellation and will act as “the backhaul data transport layer for the broader SDN,” SSC said. In SSC’s description, the “SDN Backbone is a pLEO [proliferated LEO] satellite constellation which functions as an integrated network, providing robust, resilient, high-capacity, and low-latency data transport for the Joint Force.” The release added that the award will “enhance the network with an expanded optically interconnected mesh of satellites delivering world-wide tactical communications and broadband communication services.”
How the SDN fits into the Space Data Network and sensors-to-shooters goal
SSC described the Space Data Network (SDN) as the service’s central communications network to “link sensors to shooters.” The SDN Backbone will serve as a core data-transport layer within that architecture, supporting the SDN’s role as “a core communications layer for the USSF warfighting systems,” according to Col. Ryan Frazier, acting Space Force portfolio acquisition executive for Space Based Sensing & Targeting. Col. Frazier said the SDN Backbone “supports the broader SDN, which acts as a core communications layer for the USSF warfighting systems, ensuring our sensors and shooters are connected continuously, globally and securely.”
Budget context: recent and requested funding levels
The size of the award stood out against previously published budget figures. The Space Force’s fiscal 2026 budget included $277 million for MILNET. For fiscal 2027, SSC’s request asks for $1.5 billion in SDN Backbone research and development and another $1.6 billion in procurement, with both funds to be provided via the reconciliation package, the release said. SSC framed the $2.29 billion award as an acceleration of fielding that intersects directly with those budget lines.
How the Space Force, SpaceX, and the Space Development Agency are affected
- Space Force (USSF): The award advances the service’s plan to make the SDN a central, continuous communications layer linking sensors and shooters; it also sets a concrete delivery milestone — a “fully operational prototype capability by the end of 2027” — that the service will use to measure progress.
- SpaceX: The company will expand its Starshield-based offering into a military backbone role and is contractually tasked with meeting the accelerated delivery timeline and implementing an “optically interconnected mesh” across a pLEO constellation.
- Space Development Agency (SDA): SSC noted that the SDA’s Transport Layer satellites in LEO are part of the broader SDN; the Backbone therefore must interoperate with SDA Transport Layer satellites as the service builds a mesh network of diverse satellites in multiple orbits to support missions including the Pentagon’s Golden Dome missile defense shield.
The award formalizes a shift from concept to a time-bound prototype: Space Systems Command has specified architecture (pLEO, optical mesh, Starshield backbone), a contractor (SpaceX), a dollar figure ($2.29 billion), and a delivery deadline (end of 2027). It also ties the program to larger budget requests for FY27 and to existing SDA Transport Layer work, including the SDN’s role in supporting the Golden Dome missile defense shield. The immediate observable milestones are clear; how integration, procurement pacing, and congressional reconciliation will shape the program’s next 18 months remains to be seen.
