# Kratos Wins $33.6M NASA Spacecraft Subcontract

On October 28, 2026, Kratos Defense & Security Solutions received a **$33.6 million subcontract** from Sierra Lobo to design, build, and deliver the closed Brayton cycle power conversion system for NASA’s Space Reactor-1 (SR-1) Freedom mission under the SpaceDOC III contract. Targeted for launch in 2028, SR-1 is intended to demonstrate nuclear electric propulsion on an interplanetary spacecraft, establishing a potential basis for future deep-space power and propulsion work, including the envisioned Lunar Reactor-1 concept.

- The award identifies a defined role for Kratos as subcontractor and Sierra Lobo as prime contractor on a NASA mission; firms pursuing similar work should note the specialized power-conversion and nuclear-spacecraft capabilities involved.
- The mission may create follow-on opportunities in deep-space power and propulsion, although the signal does not identify a separate solicitation or open competition.
- Suppliers and subcontractors with relevant technical capabilities can use the SR-1 system scope and 2028 launch target to assess potential alignment with future NASA space-power efforts, including the Lunar Reactor-1 concept.

**Jurisdictions:** federal
**Industries:** Energy & Utilities
**Published:** October 29, 2026

### Government Entities
- National Aeronautics and Space Administration (NASA)

### Vendors
- Kratos Defense & Security Solutions, Inc. (Subcontractor)
- Sierra Lobo, Inc. (Prime contractor)

### Sources
- [A historic mission. A critical power system. A journey to Mars. 🚀 Kratos has received a $33.6M contract to provide the power conversion system for NASA’s SR-1 Freedom nuclear-powered spacecraft, targeted for launch in 2028. Read more: https://t.co/AD02Qz610v #Kratos @NASA Photo ](https://x.com/KratosDefense/status/2115819229278601428) - twitter-agency