# Resilient MW/MT - LEO — Program Element 1206446SF

**Program element:** 1206446SF  
**Component:** U.S. Space Force  
**Appropriation:** 3620F — RDT&E, Space Force  
**Budget Activity:** 5 — System Development & Demonstration  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/1206446SF

## Summary

U.S. Space Force funding ramps 110% to a $3.56B request in FY2027 — the program's peak. In the FY2027 defense authorization, the House funded it in full; the Senate funded it in full; House appropriators cut 15% (to $3.02B).

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 1,697.8 |
| FY2026 | Enacted | 1,695.5 |
| FY2027 | Request | 3,564.2 |
| FY2028 | Outyear | 2,933.2 |
| FY2029 | Outyear | 3,130.6 |
| FY2030 | Outyear | 2,945.6 |
| FY2031 | Outyear | 3,010.5 |

> Estimate types are not summed — the profile mixes actuals, enacted law, the request, and outyear projections.

## Congressional marks (FY2027)

| Stage | Marked ($M) | Change ($M) |
|---|---|---|
| Request | 3,564.2 | — |
| House NDAA (HASC) | 3,564.2 | +0.0 |
| Senate NDAA (SASC) | 3,564.2 | +0.0 |
| House Approps (HAC-D) | 3,024.2 | −540.0 |

> FY2027 NDAA authorization marks, as of 2026-07-27. Not appropriations or final law.

## Projects (1)

| Project | Title | FY2025 actual | FY2026 enacted | FY2027 request | Move |
|---|---|---|---|---|---|
| 657LEO | Resilient MW/MT - LEO | 1,697.8 | 1,695.5 | 3,564.2 | +110% |

> Projects are the summable leaves: the program element total is their sum, never added to it.

### Project 657LEO — Resilient MW/MT - LEO

The Space Development Agency (SDA) is developing and demonstrating the Proliferated Warfighter Space Architecture (PWSA) Tracking Layer (Project 657LEO) for Guardians across the Combat Support, Satellite Communications, Operations, and Warfighting mission areas. As a result, the Service will improve readiness and operational reach of existing force structure and continue to advance all near term effects. SDA is rapidly developing and demonstrating next generation space capabilities for the joint warfighter enabled by proliferation of satellites in Low Earth Orbit (LEO) and a new acquisition model utilizing rapid spiral development. SDA is advancing a proliferated space architecture to address a wide range of Department of War (DoW) space needs aligned with the United States Space Force Space Warfighting Framework, including advanced missile tracking and global surveillance enabling beyond-line-of-sight targeting. In coordination with Combatant Commands and other DoW Space stakeholders, SDA will orchestrate the rapid development and fielding of the Proliferated Warfighter Space Architecture (PWSA), a resilient military sensing and data transport capability via a proliferated space architecture in LEO. This program element funds the development and demonstration of space technologies to deliver Missile Warning, Missile Tracking and Missile Defense (MW/MT/MD) and Fire Control capabilities to U.S. joint warfighting forces in bi-annual tranches, which began in FY 2022. As part of the PWSA, SDA is building and fielding the Tracking Layer, using a proliferated constellation of satellites to provide resiliency through a layered sensor net to ensure space sensing necessary to respond to incoming threats. The PWSA Tracking Layer provides worldwide persistent visibility at fidelity levels which enable low-latency detection and real-time tracking to meet critical operational timelines. The total cost of the Tracking Layer Tranche 1 (TRKT1) Middle Tier of Acquisition effort is $2,841.700 million, including RDT&E and procurement of prototype units. The TRKT1 program is fully funded across the Future Years Defense Program. The total cost of the Tracking Layer Tranche 2 (TRKT2) Middle Tier of Acquisition effort is $3,965.900 million, including RDT&E and procurement of prototype units. The TRKT2 program is fully funded across the Future Years Defense Program.

| Activity (R-2A) | FY2025 | FY2026 | FY2027 |
|---|---|---|---|
| Resilient Missile Warning Missile Tracking - Low Earth Orbit (LEO) | 1,697.8 | 1,695.5 | 3,564.2 |

> R-2A activities carry the prior, current and budget year only — no five-year plan. Coverage is partial, so count them, never total them.

## Where the FY2027 request goes

| Category | Share | $M |
|---|---|---|
| Government labs & warfare centers | 0.6% | 20.7 |
| Other / unspecified | 99% | 3,543.5 |

> R-3 exhibit contract funding, not USAspending obligations.

## Mission & acquisition strategy

The Space Development Agency (SDA) is developing and demonstrating the Proliferated Warfighter Space Architecture (PWSA) Tracking Layer (Project 657LEO) for Guardians across the Combat Support, Satellite Communications, Operations, and Warfighting mission areas. As a result, the Service will improve readiness and operational reach of existing force structure and continue to advance all near term effects. SDA is rapidly developing and demonstrating next generation space capabilities for the joint warfighter enabled by proliferation of satellites in Low Earth Orbit (LEO) and a new acquisition model utilizing rapid spiral development.

Partners for these activities may include Missile Defense Agency (MDA), Space Systems Command (SSC), Space Operations Command (SpOC), Space Training and Readiness Command (STARCOM), DoW Combatant Commands, DoW research centers, small businesses, non-traditional aerospace and defense contractors, large defense contractors, commercial space providers, Federally Funded Research and Development Centers, and University Affiliated Research Centers. SDA's Tracking Layer Tranche 1, Tracking Layer Tranche 2, and Tracking Layer Tranche 3 space systems are being acquired via Firm Fixed Price contracts conducted in accordance with Other Transaction Authority (OT) for prototyping processes.

## Related program elements

- [1206410SF — Space Technology Development and Prototyping](https://hitchintel.com/programs/1206410SF) (Space Force)
- [1206443SF — Next-Gen OPIR Space GEO](https://hitchintel.com/programs/1206443SF) (Space Force)
- [0607385BR — Counter Weapons OF MASS Destruction Operational Systems Development](https://hitchintel.com/programs/0607385BR) (Defense-Wide)
- [0605000BR — Counter Weapons OF MASS Destruction Systems Development](https://hitchintel.com/programs/0605000BR) (Defense-Wide)

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibits R-2/R-3, PE 1206446SF (PB PB2027); FY2027 NDAA committee marks (as of 2026-07-27).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="1206446SF")`.

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