# Project 9999 — Congressional Adds

**Program element:** 0604307N — Surface Combatant Cmbt Sys Eng  
**Project:** 9999  
**Component:** U.S. Navy  
**Appropriation:** 1319 — RDT&E, Navy  
**Budget Activity:** 5 — System Development & Demonstration  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0604307N/9999  
**Parent:** https://hitchintel.com/programs/0604307N

## Summary

Project 9999 — Congressional Adds requests $0.0M in FY2027, 0.0% of the $425.1M requested for program element 0604307N, down 100% on FY2026.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 0.0 |
| FY2026 | Enacted | 91.2 |
| FY2027 | Request | 0.0 |
| FY2028 | Outyear | 0.0 |
| FY2029 | Outyear | 0.0 |
| FY2030 | Outyear | 0.0 |
| FY2031 | Outyear | 0.0 |

> Estimate types are not summed. This project is one leaf of PE 0604307N; the PE total is the sum of its projects, never added to them.

## What project 9999 buys

PATRIOT ADVANCED CAPABILITY 3 (PAC-3) Development Integration and test supports the integration of Patriot Advanced Capability-3 (PAC-3) missile system into the Aegis Combat System. This integration will significantly enhance the warfighting capabilities of the U.S. Navy by providing an expanded battlespace, improved threat defeat timelines, and a layered defense against advanced air and missile threats. The effort includes the following key components: 1. Software Integration: Development and integration of software modifications to the Aegis Weapon System to effectively control and employ the PAC-3 missile. This includes adapting existing fire control logic, developing new engagement protocols, and ensuring seamless data exchange between Aegis and the PAC-3 system. 2. Missile Modifications: Development of a compatible radio system for the PAC-3 missile to enable secure and reliable communication with the Aegis Weapon System to enable missile guidance. Includes funding to adapt the PAC-3 missile system to the maritime environment in order to pass environmental testing and safety qualification. 3. Mk-41 VLS Adaptation: Development of a canister for the PAC-3 missile which is compatibility with the Mk-41 Vertical Launching System (VLS) currently deployed on Aegis destroyers. This includes mechanical, electrical, and software modifications to ensure safe and reliable launch from the VLS.

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

## 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/0604307N.

## Source & machine access

- **Source:** FY2027 Department of the Navy RDT&E Budget Justification, Exhibits R-2/R-2A/R-3, PE 0604307N project 9999 (PB PB2027).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0604307N")`.

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