# Mobile User Objective System (MUOS) Service Life Extension (SLE)

**R-2A activity** of project 673109 — SATCOM MUOS  
**Program element:** 1203109SF — Satcom MUOS  
**Component:** U.S. Space Force · **Budget Activity:** 7  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/1203109SF/673109/a1  
**Parent:** https://hitchintel.com/programs/1203109SF

## Summary

This activity requests $835.3M in FY2027, 98% of project 673109, up 115% on FY2026. The R-2A exhibit describes it across FY2026–FY2027, including what the FY2027 money is planned to buy.

## What the FY2027 request buys

**FY2027 planned work.** Conduct and complete the Final Design Review (FDR) for MUOS Space Vehicle (SV) 6 and 7. Continue acquiring long-lead materials for MUOS SV 6 and 7. Conduct Manufacturing Readiness Review for MUOS SV 6. Start production of MUOS SV 6. Retrofit technologies to be interoperable with the Baseline Space MUOS (1-5) system while modernizing satellite functionality to maintain global communications. Continue ground system modernization across all four RAFs, with associated laboratory equipment and associated program office support, through migration to an extensible digital processing architecture. Ground activities include interface testing & verification, and architecture upgrades. Complete installation of D-ETI at Niscemi (Sicily, Italy) RAF. Continue incremental recapitalization of obsolete third generation cellular network equipment at RAFs. Continue architecture updates for network resiliency that include commercial SATCOM augmentation of terrestrial inter-RAF links and replication of critical network management functions in a secure cloud network or alternate site. Rapidly respond to implement system resiliency and situational awareness necessary to operate in the contested space domain. Activities may include, but are not limited to program office support, studies, technical analysis, experimentation, risk reduction, prototyping, and activities that may leverage commercial, U.S. Government partnership, and international opportunities to respond to existing and emerging adversarial threats with speed and agility.

**FY2026 to FY2027 change.** FY 2027 funding increase is driven by the SLE Phase II contract. This increase supports a ramp-up of non-recurring engineering hours in support of the Early Design Review (EDR), Final Design Review (FDR) and production initiation for Space Vehicles (SV) 6 and 7, and secures vital long-lead materials. This funding is critical to maintain the program schedule and achieve the December 2031 operational need date for warfighter capability.

## Before the request year

**FY2026 plans — current year.** Award contract to one vendor to complete MUOS SLE satellite final design, production, and integration activities. Begin acquiring long-lead materials for production. Conduct and complete the Early Design Review (EDR) for MUOS Space Vehicle (SV) 6 and 7. Retrofit technologies to be interoperable with the Baseline Space MUOS (1-5) system while modernizing satellite functionality to maintain global communications. Continue ground system modernization across all four RAFs, with associated laboratory equipment and associated program office support, through migration to an extensible digital processing architecture. Ground activities include interface testing & verification, and architecture upgrades. Continue Narrowband Analysis of Alternatives (AoA) follow-on studies. Continue incremental recapitalization of obsolete third generation cellular network equipment at RAFs. Continue architecture updates for network resiliency that include commercial SATCOM augmentation of terrestrial inter-RAF links and replication of critical network management functions in a secure cloud network or alternate site Rapidly respond to implement system resiliency and situational awareness necessary to operate in the contested space domain. Activities may include, but are not limited to program office support, studies, technical analysis, experimentation, risk reduction, prototyping, and activities that may leverage commercial, U.S. Government partnership, and international opportunities to respond to existing and emerging adversarial threats with speed and agility.

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 173.1 |
| FY2026 | Enacted | 388.7 |
| FY2027 | Request | 835.3 |

> Prior, current and budget year only — an R-2A activity carries no five-year plan. It sums exactly into its project in the request year and not necessarily in any other.

## Other activities in project 673109

- [Mobile User Objective System (MUOS) Baseline Upgrade](https://hitchintel.com/programs/1203109SF/673109/a0) — FY2027 20.6

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibit R-2A, PE 1203109SF project 673109 (PB PB2027). Narrative is the government's own text.
- **No marks, no contractors at this grain** — congressional marks land on the program element and R-3 performers on the project.
- **MCP:** `mcp.hitchintel.com` — `budget_get_activity`.

*HitchAI is an independent intelligence service, not affiliated with the U.S. Department of Defense. Budget figures are requests/estimates, not obligations.*