A new government report casts a serious shadow of doubt over the future of the Space Development Agency’s (SDA) pivotal program to deploy a constellation of missile warning and tracking satellites in low Earth orbit (LEO). The initiative, designed to defend against hypersonic threats, is reportedly at risk of failing to meet both its own ambitious goals and the critical needs of operators.
Technical Glitches and Chronic Delays Plague Project
The document, titled „Missile Warning Satellites: Space Development Agency Should Be More Realistic and Transparent About Risks to Capability Delivery,” recently released by the Government Accountability Office (GAO), details a litany of issues. While the review specifically scrutinized SDA’s „Tracking Layer” activities, its findings suggest many of these problems extend across SDA’s broader effort to build a network of LEO constellations for its Proliferated Warfighter Space Architecture (PWSA), which also encompasses the „Transport Layer” for data relay and associated ground systems.
The GAO directly accuses SDA of “overestimating the technology readiness of some critical elements it plans to use.” This includes the spacecraft being developed and operated by multiple vendors, which, according to the GAO, have required modifications that led to “additional unplanned work” by contractors and “added to already delayed schedules.”
Uncertainty Against Modern Threats
Perhaps the most alarming finding is that SDA and its contractors “have yet to demonstrate the development of timely, actionable, and accurate two-dimensional tracks on orbit and three-dimensional tracks on the ground needed to counter hypersonic and other evolving threats.” This deficiency raises serious questions about the system’s actual capability to fulfill its vital mission.
Despite SDA’s reports of “achieving early milestones” as it advances with new satellite variants—dubbed Tranches—every two years, the GAO emphasizes that these reports “do not reflect schedule risks” and the agency has not “developed an overall or architecture-level schedule” that would allow for a clearer understanding of genuine progress.
Billions Invested, Future Costs Undefined
As of July 2025, the report indicates that SDA has awarded contracts totaling $4.7 billion for 101 satellites across Tranches 0, 1, and 2 of the Tracking Layer, engaging six prime contractors: L3Harris Technologies, Lockheed Martin, Northrop Grumman, Raytheon, Sierra Space, and SpaceX. In December, the agency issued four additional contracts, valued at $3.5 billion, for a total of 72 Tranche 3 satellites, awarded to teams led by Lockheed Martin, Rocket Lab USA, Northrop Grumman, and L3Harris.
However, the report stresses that the Tracking Layer satellites are expected to have a lifespan of only five years, after which SDA will need to replace them—a significant cost that remains undefined. “[T]he Department of Defense (DOD) does not know the life-cycle cost to deliver missile warning and tracking capabilities because it has not created a reliable cost estimate,” the GAO critiques.
Transparency Lapses Leave Operators in the Dark
Furthermore, SDA’s requirements process is deemed opaque, even to the operators who are intended to use the Tracking Layer constellation. “For example, SDA is not sufficiently collaborating with combatant commands, which report having insufficient insight into how SDA defines requirements and when, or whether, SDA will deliver planned capabilities. Consequently, SDA is at risk of delivering satellites that do not meet warfighter needs,” the report states.
Urgent Recommendations for Course Correction
The GAO has put forth six key recommendations for the Office of the Secretary of the Air Force, which oversees SDA’s acquisition and budget plans, aimed at rectifying the situation:
- Ensuring SDA “conducts and documents a tailored technology readiness assessment for new critical technology elements inserted in each future tranche,” beginning with Tranche 3.
- Ensuring the agency follows the process outlined in its Warfighter Council charter “to collaboratively, with warfighter participants, identify, define, and prioritize requirements, and present regular opportunities for interactive feedback and warfighter response.”
- Ensuring SDA can trace back “between overall mission warning and mission tracking requirements and tranche development efforts.”
- Ensuring SDA “develops and maintains an architecture-level networked schedule” for the overarching PWSA, “that reflects both government and contractor activities.”
- Requiring the agency to mandate that contractors provide “Cost and Software Data Reporting.”
- Ensuring SDA “develops and establishes reliable, data-driven cost estimates and a process for regularly updating these estimates that supports cost-informed decision-making beginning with Tranche 3.”
In a letter to the GAO dated December 16, from then-acting head of Air Force space acquisition Maj. Gen. Stephen Purdy, the Pentagon concurred with five of the recommendations and partially concurred with one, asserting that SDA is already compliant with Department of the Air Force requirements for Cost and Software Data Reporting and will continue to be so.
SDA, conversely, expressed some disagreement with the GAO’s assessment. Jennifer Elzea, SDA spokesperson, stated that the “Space Development Agency appreciates the time and the attention to detail the Government Accountability Office applied to their review of Tracking layer delivery readiness for the Proliferated Warfighter Space Architecture (PWSA). In general, SDA disagreed with the specifics of many of the report’s assertions; however, the agency will work through the report’s recommendations to determine areas where we might improve our process, transparency, and warfighter capability delivery.”
