# Radar Development — Program Element 0604820A

**Program element:** 0604820A  
**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

## Summary

U.S. Army requests $58.3M in FY2027, sustained across the five-year plan. In the FY2027 defense authorization, the House funded it in full; the Senate funded it in full; House appropriators funded it in full. Lockheed Martin leads the industry work.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 40.1 |
| FY2026 | Enacted | 53.2 |
| FY2027 | Request | 58.3 |
| FY2028 | Outyear | 188.1 |
| FY2029 | Outyear | 60.4 |
| FY2030 | Outyear | 60.4 |
| FY2031 | Outyear | 61.0 |

> 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 | 58.3 | — |
| House NDAA (HASC) | 58.3 | +0.0 |
| Senate NDAA (SASC) | 58.3 | +0.0 |
| House Approps (HAC-D) | 58.3 | +0.0 |

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

## Projects (2)

| Project | Title | FY2025 actual | FY2026 enacted | FY2027 request | Move |
|---|---|---|---|---|---|
| E10 | Sentinel | 26.2 | 18.9 | 33.2 | +76% |
| PS1 | Army Long Range Persistent Surveillance (ALPS) | 13.8 | 34.4 | 25.0 | −27% |

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

### Project E10 — Sentinel

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.

**Named R-3 performers** (share of this project's FY2027 R-3 total, so they need not reach 100%)**:** Lockheed Martin (15.0, 45%).

| Activity (R-2A) | FY2025 | FY2026 | FY2027 |
|---|---|---|---|
| Product Development | 13.1 | 9.0 | 12.1 |
| Test & Evaluation | 13.1 | 9.8 | 11.1 |
| Electronic Attack/Electronic Protect | — | — | 10.0 |

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

### Project PS1 — Army Long Range Persistent Surveillance (ALPS)

The FY 2027 request for ALPS includes $25.042 million of funding. These funds will support the Army Long-Range Persistent Surveillance (ALPS) sensor, which is a persistent, passive air surveillance sensor system. ALPS capabilities include long-range, 360-degree surveillance against conventional fixed wing and rotary wing aircraft, UAS, and cruise missiles. ALPS supports tactical to strategic operations via its capability to connect with multiple Army and Joint Command and Control systems including the Integrated Fire Control Network (IFCN). In FY 2025, Project PS1 /Army Long Range Persistent Surveillance (ALPS) was a new effort realigned within PE 0604820A / Radar Development. Funding realigned from PE 0604741A / Air Defense Command Control and Intelligence - Eng Dev, Project 126 /PEO Electronic Protect for the design, development, integration, and test of ALPS. The ALPS program was started as an urgent capability in response to multiple Combatant Commands identified operational needs. The ALPS program tasks include all programmatic and engineering activities needed to modernize systems currently supporting multiple Combatant Commands and design/development effort to provide a passive mobile capability to Army Air and Missile Defense forces.

| Activity (R-2A) | FY2025 | FY2026 | FY2027 |
|---|---|---|---|
| Program Development and Support | 13.8 | 34.4 | 25.0 |

> 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 |
|---|---|---|
| Industry primes | 26% | 15.0 |
| Other / unspecified | 74% | 43.3 |

**Top named industry performers:** Lockheed Martin ($15.0M, 26%).

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

## Mission & acquisition strategy

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 modification was competitively awarded to Lockheed Martin as a Fixed Price Incentive Firm (FPIF) contract to develop a modified Sentinel with a new Active Electronically Scanned Array (AESA) antenna. The Sentinel A3 and its predecessors were procured from Raytheon as a non-developmental item. The U.S. Government does not have adequate data rights for the Sentinel A3 and its predecessors; therefore no other contractor has the technical ability to modify the Sentinel A3 radar or Sentinel A3 software. The Sentinel programs are a component of an integrated fires development effort that includes survivability, resiliency, and effectiveness improvements against advanced threats from adversaries.

## Related program elements

- [0604804A — Logistics and Engineer Equipment - Eng Dev](https://hitchintel.com/programs/0604804A) (Army)
- [0607658N — Cooperative Engagement Capability](https://hitchintel.com/programs/0607658N) (Navy)
- [0607137A — Chinook Product Improvement Program](https://hitchintel.com/programs/0607137A) (Army)
- [0603890C — BMD Enabling Programs](https://hitchintel.com/programs/0603890C) (Defense-Wide)

## Source & machine access

- **Source:** FY2027 Department of the Army RDT&E Budget Justification, Exhibits R-2/R-3, PE 0604820A (PB PB2027); FY2027 NDAA committee marks (as of 2026-07-27).
- **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.*