# Project E10 — Sentinel

**Program element:** 0604820A — Radar Development  
**Project:** E10  
**Component:** U.S. Army  
**Appropriation:** 2040 — RDT&E, Army  
**Budget Activity:** 5 — System Development & Demonstration  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0604820A/E10  
**Parent:** https://hitchintel.com/programs/0604820A

## Summary

Project E10 — Sentinel requests $33.2M in FY2027, 57% of the $58.3M requested for program element 0604820A, up 76% on FY2026. 3 R-2A activities decompose the request, 1 new this cycle. Lockheed Martin is the largest named R-3 performer at $15.0M, 45% of the project's FY2027 R-3 total.

**Markets:** Nuclear Modernization — matched on the project title only, and no market size is quoted.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 26.2 |
| FY2026 | Enacted | 18.9 |
| FY2027 | Request | 33.2 |
| FY2028 | Outyear | 150.8 |
| FY2029 | Outyear | 28.3 |
| FY2030 | Outyear | 28.3 |
| FY2031 | Outyear | 28.6 |

> Estimate types are not summed. This project is one leaf of PE 0604820A; the PE total is the sum of its projects, never added to them.

## What project E10 buys

Supports enhancements, upgrades and continued testing of the Army Modernization Priorities in support of the Sentinel Radar programs and will provide for an incrementally fielded Integrated Air and Missile Defense Fire Control System/capability for the composite Army Air and Missile Defense Brigades. The Sentinel systems are a key component of the Army Integrated Air and Missile Defense (AIAMD) architecture, providing critical air surveillance of the forward areas. The Sentinel A4 utilizes Active Electronically Scanned Array (AESA) technology that is a ground-based sensor system designed to locate, identify and track Cruise Missiles, Fixed-Wing and Rotary-Wing Aircraft, Unmanned Aircraft Systems and Rocket, Artillery, and Mortar (RAM) projectiles. The simultaneous multi-mission Sentinel A4 system will provide 360-degree surveillance and tracking with the ability to handle simultaneous threats arriving from different azimuths. The Sentinel A3 consists of a trailer mounted radar with its prime mover, generator, identification Friend or Foe (IFF) system and Forward Area Air Defense Command, Control and Intelligence (FAAD C2I) systems interface. The Sentinel A3 provides persistent surveillance and fire control quality data on Army and Joint networks through external C2 platforms enabling protection of U.S. and coalition forces as well as critical geo-political assets against Cruise Missiles (CM), Fixed-Wing, Rotary-Wing Aircraft and Unmanned Aircraft System (UAS) threats.

**R-3 lines of work:** Management Services; Product Development; Test and Evaluation.

## Named R-3 performers

| Performer | $M | Share of this project's FY2027 R-3 total |
|---|---|---|
| Lockheed Martin | 15.0 | 45% |

> Budget-justification contract funding, not obligations. Shares need not reach 100% — unnamed and government work is in the denominator.

## Activities (R-2A) — 3

| Activity | FY2025 | FY2026 | FY2027 | Move | Page |
|---|---|---|---|---|---|
| Product Development | 13.1 | 9.0 | 12.1 | +34% | [a0](https://hitchintel.com/programs/0604820A/E10/a0) |
| Test & Evaluation | 13.1 | 9.8 | 11.1 | +13% | [a1](https://hitchintel.com/programs/0604820A/E10/a1) |
| Electronic Attack/Electronic Protect | — | — | 10.0 | new | [a2](https://hitchintel.com/programs/0604820A/E10/a2) |

> Activities carry the prior, current and budget year only — no five-year plan. In the request year they partition this project exactly; in earlier years they can under-cover it.

### Product Development

Sentinel A4: Continuously integrate and deliver software enhancements to Sentinel A4 to combat evolving threat based on phase two of IOT&E findings. The program will develop and implement new signal processing techniques and waveforms to enhance Electronic Attack and Electronic Protect techniques based on the evolving threat, further…

Full year-by-year narrative: https://hitchintel.com/programs/0604820A/E10/a0

### Test & Evaluation

Sentinel A4: Funding will support further developmental and operational testing of the Sentinel A4 program against evolving theater specific threats. Will allow for continued software qualification and hardware testing, as well as field testing against representative targets. Sentinel A3: Funding supports required documentation for…

Full year-by-year narrative: https://hitchintel.com/programs/0604820A/E10/a1

### Electronic Attack/Electronic Protect — NEW START

- Develop and implement new signal processing techniques and waveforms to enhance Electronic Attack and Electronic Protect techniques based on the evolving threat, further enhancing radar survival and effectiveness in contested environments - Continue to develop software following the combined practices of Continuous…

Full year-by-year narrative: https://hitchintel.com/programs/0604820A/E10/a2

## What is NOT on this page

Congressional marks, the R-2 mission description and acquisition strategy, the industry vs government split of the whole request, and related program elements are recorded at **program-element** grain — an NDAA mark lands on a PE, never on a project. They are at https://hitchintel.com/programs/0604820A.

## Source & machine access

- **Source:** FY2027 Department of the Army RDT&E Budget Justification, Exhibits R-2/R-2A/R-3, PE 0604820A project E10 (PB PB2027).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0604820A")`.

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