# Homeland Defense Over the Horizon Radar Development

**R-2A activity** of project 650011 — HLD - OTHR  
**Program element:** 0102417F — Over-the-Horizon Backscatter Radar  
**Component:** U.S. Air Force · **Budget Activity:** 5  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0102417F/650011/a0  
**Parent:** https://hitchintel.com/programs/0102417F/650011

> **RESTART.** Funded in FY2025 ($367.5M), zeroed in FY2026, $77.9M requested again in FY2027.

## Summary

This activity requests $77.9M in FY2027, 100% of project 650011 — a restart, funded in FY2025 and zeroed in 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.** - Utilize Winter Study results and ionospheric model to inform system design and algorithm development - Continue system design and supply chain market research - Develop training material and technical documentation for operators - Complete set of planned activities are held at a higher level

**FY2026 to FY2027 change.** The FY 2026 President's Budget submittal did not reflect the FY 2027 through FY 2030 funding. Therefore, an explanation of the changes between the two budget positions for FY 2027 cannot be made in a relevant manner.

## Before the request year

**FY2026 plans — current year.** The following CY efforts are being executed using FY 2025 carryover funds and are also be communicated in the BA7 R-Doc: - Conducting wintertime experimentation study (install, checkout, operate) with DoD S&T community - Utilizing Winter Study results and ionospheric model development to inform predicted performance metrics - Continue ionospheric model development, and start tool improvements to improve system performance at northern latitudes - Start system design via GRA development while evaluating/researching supply chain market to meet intended system design - Complete planned integration activities in support of classified requirements

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 367.5 |
| FY2026 | Enacted | 0.0 |
| FY2027 | Request | 77.9 |

> 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.

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibit R-2A, PE 0102417F project 650011 (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.*