# Flight Systems

**R-2A activity** of project 655238 — GROUND BASED STRATEGIC DETERRENT (GBSD)  
**Program element:** 0605238F — Ground BASED Strategic Deterrent (GBSD)  
**Component:** U.S. Air Force · **Budget Activity:** 5  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0605238F/655238/a0  
**Parent:** https://hitchintel.com/programs/0605238F

## Summary

This activity requests $1.45B in FY2027, 32% of project 655238, up 69% 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.** Continue to implement updated specifications, execute design reviews, and mature critical components like AVE, support systems, specialized support equipment, cybersecurity, and nuclear surety architectures. Continue to refine the Mission Modeling Framework to assess performance against evolving threats. Continue to mature the weapon system through trade studies, modeling, simulation, and analysis. Continue to ensure seamless integration of cryptographic systems and Department of Energy technologies through software development, hardware integration, and collaboration with government agencies. Continue to integrate the ICBM Fuze Modernization and Mk21A Reentry Vehicle to the LGM-35A Sentinel weapon system. Increase efforts to leverage mission partners to conduct in-depth technical analysis, digital modeling, subsystem testing, to maintain a strong technical baseline. Increase efforts to pursue initiatives to optimize the schedule, reduce risks, and minimize lifecycle costs while incorporating evolving threat information and higher-fidelity designs into weapon system assessments. Increase efforts to develop an adaptable industrial base by developing mission effectiveness capabilities, thereby improving certification strategies, and developing comprehensive sustainment strategies for all system components.

**FY2026 to FY2027 change.** Funding increased due to the risk reduction / parallel path efforts identified through the program restructure activities, TMRR efforts to achieve MS-B, and the EMD prime contract schedule incentive fee identified in the "Omni-Mod” contract framework.

## Before the request year

**FY2026 plans — current year.** Implement updated specifications, execute design reviews, and mature critical components like AVE, support systems, cybersecurity, and nuclear surety architectures. Refine the Mission Modeling Framework to assess performance against evolving threats. Mature the weapon system through trade studies, modeling, simulation, and analysis. Ensure seamless integration of cryptographic systems and Department of Energy technologies through software development, hardware integration, and collaboration with government agencies. Integrate the ICBM Fuze Modernization and Mk21A Reentry Vehicle to the LGM-35A Sentinel weapon system. Leverage mission partners to conduct in-depth technical analysis, subsystem testing, to maintain a strong technical baseline. Pursue initiatives to optimize the schedule, reduce risks, and minimize lifecycle costs while incorporating evolving threat information and higher-fidelity designs into weapon system assessments. Establish an adaptable industrial base by developing mission effectiveness capabilities, thereby improving certification strategies, and developing comprehensive sustainment strategies for all system components.

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 522.6 |
| FY2026 | Enacted | 858.0 |
| FY2027 | Request | 1,452.8 |

> 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 655238

- [Command & Launch](https://hitchintel.com/programs/0605238F/655238/a1) — FY2027 981.7
- [Systems Engineering](https://hitchintel.com/programs/0605238F/655238/a4) — FY2027 783.0
- [Government Support](https://hitchintel.com/programs/0605238F/655238/a6) — FY2027 433.6
- [Test](https://hitchintel.com/programs/0605238F/655238/a5) — FY2027 409.8
- [Software](https://hitchintel.com/programs/0605238F/655238/a3) — FY2027 292.7
- [Infrastructure & Deployment](https://hitchintel.com/programs/0605238F/655238/a2) — FY2027 167.8

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibit R-2A, PE 0605238F project 655238 (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.*