Full Breakdown
Golden Dome Expansion: SDA Awards $1.75 B for 36 New Missile-Tracking Satellites
7/14/2026, 10:16:05 PM
Core Contract Details
On July 13, 2026 the U.S. Space Development Agency (SDA) announced firm-fixed-price contracts totaling about $1.75 billion with L3Harris Technologies and Sierra Space. Each company will design, build, test and deliver 18 low-Earth-orbit satellites for the Accelerated Missile Defense Tranche 3 (AMDT3) segment of the Tracking Layer. The 36 spacecraft are slated for launch readiness by the end of 2028 and will integrate with the existing Tranche 1-3 constellation that underpins the “Golden Dome” missile-defense architecture.
Background & Architecture
The “Golden Dome for America” shield is the Trump administration’s proposal to create a proliferated network of infrared-sensor satellites, ground stations and low-latency links that provide global, persistent missile-warning, tracking and fire-control data. The Tracking Layer, part of the Proliferated Warfighter Space Architecture (PWSA), already fields 72 satellites from earlier tranches. AMDT3 expands the layer to 104 spacecraft across four orbital planes, improving coverage against ballistic and hypersonic threats from China and Russia.
Key Contractors & Roles
- L3Harris Technologies – awarded $955 million for 18 “missile-defense” satellites equipped with medium-field-of-view payloads derived from the Hypersonic and Ballistic Tracking Space Sensor (HBTSS). Production will use facilities in Indiana and Florida.
- Sierra Space – awarded $798 million for 18 “missile-warning/tracking” satellites built on the Horizon bus, a modular platform from the company’s Eclipse satellite family. Manufacturing will occur at the “Victory Works” plant in Louisville, Kentucky.
Data & Timeline
| Date | Event | Details |
|---|---|---|
| July 13 2026 | SDA contract award | $1.75 bn for 36 AMDT3 satellites |
| Late 2028 | Launch readiness | All 36 satellites to be ready for launch |
| 2024-2025 | Tranche 2 delivery | Sierra Space completed 18 Horizon structures ahead of schedule |
| 2026 | Senate Armed Services Committee draft | Calls for at least 45 HBTSS-like satellites in Tranche 3 |
Official Statements & Responses
The SDA emphasized that the awards “accelerate the deployment of the Tracking Layer” to give the homeland, deployed forces and allies “global, persistent indications, detection, identification warning, tracking, and defence against advanced and evolving missile threats.” L3Harris highlighted the contract as a continuation of its successful HBTSS on-orbit demonstration, while Sierra Space framed the work as proof of its industrial depth and risk-management capabilities. The Senate Armed Services Committee’s draft report urged the Space Force to prioritize fielding a full constellation of at least 45 HBTSS-equipped satellites, reflecting congressional pressure for a larger, faster-growing network.
Criticism & Legislative Push
Lawmakers have expressed concern that the existing schedule may not keep pace with adversary advances. The committee’s language to mandate a minimum of 45 HBTSS-type satellites signals a demand for greater quantity and quicker delivery, suggesting that the current 36-satellite AMDT3 award may be insufficient to meet perceived threat levels.
Verbatim Quotes
- “With these awards, SDA is accelerating the deployment of the Tracking Layer to provide the homeland, our deployed forces, and allies with global, persistent indications, detection, identification warning, tracking, and defence against advanced and evolving missile threats.” — Gurpartap “GP” Sandhoo, Space Force Portfolio Acquisition Executive and SDA Director
- “The new contract builds on the successful on-orbit demonstration of an L3Harris Hypersonic and Ballistic Tracking Space Sensor (HBTSS) satellite and infrared sensor payload the company developed for the Missile Defense Agency,” — Chris Kubasik, CEO, L3Harris Technologies
- “By combining cutting-edge design and manufacturing systems with industrial depth and systems integration expertise, we’re able to move faster, manage risk better and deliver more cost-effective solutions,” — Dan Jablonsky, CEO, Sierra Space
- “L3Harris’ continued work in Indiana will deliver the next generation of space-based tracking capabilities that we need to protect the homeland and stay ahead of our adversaries,” — Jim Banks, U.S. Senator
Conflicting Reports & Gaps
Most sources cite the contract total as $1.75 billion, but two defense-industry outlets describe the value as “almost $2 billion ($2.89 billion)”. The discrepancy is not explained in the official SDA release. Additionally, while launch dates are set for the end of 2028, no specific launch provider has been identified.
What’s Next
SDA plans to begin qualification testing of Sierra Space’s Horizon satellites in summer 2026, with system verification to follow before year-end. L3Harris will commence production at its Indiana and Florida facilities shortly after contract award. Congressional oversight is expected to continue as the Senate Armed Services Committee finalizes language for the FY 2027 National Defense Authorization Act.