R-2A Activity · President's Budget PB2027

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

Activity a1·Project 673109 — SATCOM MUOS·PE 1203109SF·U.S. Space Force
FY2027 Request
$835.3M
▲ 115% vs FY2026
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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.

FY2027 Request
$835.3M
▲ 115% vs FY2026
FY2026 Enacted
$388.7M
▲ 125% vs FY2025
FY2025 Actual
$173.1M
Prior year
Planned work

What the FY2027 request buys

Verbatim from the R-2A exhibit for project 673109 of PE 1203109SF. This is the budget justification's own description of work that has not happened yet — the one thing no other level of the budget carries.

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: the year under way

Prior-year accomplishments and current-year plans from the same exhibit. Context for the FY2027 plan, not a series — an activity partitions its project exactly in the request year, but can under-cover it in earlier years.

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.

Money

Three years, and no five-year plan

An R-2A activity publishes the prior year, the current year and the budget year. The FYDP outyears exist at project and program-element level and are deliberately absent here rather than inferred. Estimate types are colored and never summed into one figure.

2505007500173.1FY25ACTUAL388.7FY26ENACTED835.3FY27REQUEST
Actual Enacted Request
Fiscal YearEstimate TypeAmount ($M)
FY2025Actual173.1
FY2026Enacted388.7
FY2027Request835.3

This activity is 98% of project 673109's FY2027 request and 98% of PE 1203109SF's. In the request year the activities under a project sum to it exactly; in the current year they under-cover it in about 9% of cases, so an activity's delta can legitimately exceed its parent's and the two must not be compared row to row.

Where this sits

2 activities in project 673109

Every R-2A line of this project, largest FY2027 request first. Linked where the activity has enough of its own narrative to carry a page; the rest are shown in full on the program-element page.

Mobile User Objective System (MUOS) Service Life Extension (SLE) — this activity$835.3M ▲ 115%
Mobile User Objective System (MUOS) Baseline Upgrade$20.6M ▼ 23%
Source
FY2027 Department of the Air Force RDT&E Budget Justification · Exhibit R-2A · PE 1203109SF, project 673109 (President's Budget PB2027). Congressional marks are recorded on the program element, never on an activity.
Machine access
Markdown twin /programs/1203109SF/673109/a1.md · MCP mcp.hitchintel.combudget_get_activity