# Joint Simulation Environment (JSE) Development

**R-2A activity** of project 673507 — Training Systems & Simulation  
**Program element:** 0604840F — F-35 C2D2  
**Component:** U.S. Air Force · **Budget Activity:** 7  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0604840F/673507/a2  
**Parent:** https://hitchintel.com/programs/0604840F/673507

## Summary

This activity requests $22.6M in FY2027, 31% of project 673507, down 8.2% 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.** Efforts will include FIAB development, fidelity and capability upgrades to existing threats/sensors/weapons models, development of new threat/sensor/weapon models, and environment upgrades to enable effective verification of Block 4 capabilities. Efforts will continue toward expansion of JSE capability to F-35 Training Sites and providing a high-fidelity operational test laboratory for the F-35.

**FY2026 to FY2027 change.** Considering FY2027 mandatory funding in addition to discretionary, the increase from FY2026 to FY2027 is to facilitate expanded JSE T&E infrastructure to accelerate test activities resulting in accelerated integration of FIAB into the JSE enabling schedule-relevant execution of OT requirements in the FIAB-JSE simulated environment as well as earlier delivery of JSE-based training capability to the warfighter and an operationally representative simulated environment to support tactics development to enhance mission readiness.

## Before the request year

**FY2026 plans — current year.** Efforts will include modernization of F-35 In-A-Box (FIAB) software development and integration, model fidelity and capability upgrades for existing threats/sensors/weapon models, development of new threat/sensor/weapon models, and environment upgrades to enable effective verification of Block 4 capabilities. Planning efforts will continue toward expansion of JSE capability to F-35 Training Sites.

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 11.6 |
| FY2026 | Enacted | 24.7 |
| FY2027 | Request | 22.6 |

> 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 673507

- [Training Systems Capability Development (TSCD)](https://hitchintel.com/programs/0604840F/673507/a0) — FY2027 40.4
- Training Systems Architecture (TSA) Development — FY2027 9.0

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibit R-2A, PE 0604840F project 673507 (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.*