# Submarine Tactical Warfare System — Program Element 0604562N

**Program element:** 0604562N  
**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/0604562N

## Summary

U.S. Navy requests $0.0M in FY2027.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 70.1 |
| FY2026 | Enacted | 0.0 |
| 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 — the profile mixes actuals, enacted law, the request, and outyear projections.

## Projects (1)

| Project | Title | FY2025 actual | FY2026 enacted | FY2027 request | Move |
|---|---|---|---|---|---|
| 0236 | SSN Comb Cont Sys Imprvmnt (ENG) | 70.1 | 0.0 | 0.0 | — |

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

### Project 0236 — SSN Comb Cont Sys Imprvmnt (ENG)

The AN/BYG-1 is the combat control system common across all submarine platforms which incorporates tactical control, weapon/payload control and Tactical Local Area Network (TacLAN) functions into a single procurement program. AN/BYG-1 allows the submarine to rapidly update the ship-safety tactical picture, integrates the common tactical picture into the battlegroup, improves torpedo interfaces, and provides tactical TOMAHAWK, Harpoon, and future payload capability. AN/BYG-1 systems will be continuously updated with hardware enhancements to address Commercial Off The Shelf (COTS) obsolescence and provide capability improvements through software upgrades. Hardware updates are referred to as Tech Insertion (TI) kits and are differentiated by year of development (i.e. TI-22, TI-24, TI-26, etc.). The TI upgrades provide the baseline for all future AN/BYG-1 procurements. AN/BYG-1 is part of the Submarine Warfare Federated Tactical Systems (SWFTS), a family of interdependent systems that conduct cooperative system development and installations. Project Unit 0236: This program develops Commercial-Off-The-Shelf (COTS) based software and hardware upgrades for AN/BYG-1, the Multi-tube Weapons Simulator (MTWS), and the Common Weapon Launcher (CWL) in order to integrate improved tactical and payload control capabilities for all submarine classes. Provides funding for the development of Legacy Launchers; MTWS; Information Assurance system; Onboard Team Trainer (OBTT); and Common Infrastructure Services (CIS) subsystem. This includes integration of OBTT - Master Controller (OBTT - MC) & Inter-Subsystem Monitoring Tool (ISMT) efforts as well as other common services within SWFTS. FY25 continues funding for development of TI-26 and completion of TI-24. Cybersecurity efforts continue to evolve in future baselines to keep pace with the threat. Integration efforts for additional submarine payloads including MK48 ADCAP variants APB 6, APB 7 and APB 8.

| Activity (R-2A) | FY2025 | FY2026 | FY2027 |
|---|---|---|---|
| AN/BYG-1 Software Development | 30.7 | 0.0 | 0.0 |
| AN/BYG-1 Hardware Development | 16.5 | 0.0 | 0.0 |
| Testing | 3.4 | 0.0 | 0.0 |
| Payload Development and Test | 10.6 | 0.0 | 0.0 |
| CyberSecurity | 9.0 | 0.0 | 0.0 |

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

## Mission & acquisition strategy

Effective FY 2026, Project 0236 is moving from PE 0604562N to PE 0604503N as part of the PE/BLI consolidation effort in the DoD Implementation Plan from the Commission on Planning, Programming, Budgeting, and Execution (PPBE) Reform Final Report in an effort to rapidly increase Navy Lethality in the Submarine and Surface Fleet. The AN/BYG-1 is the combat control system common across all submarine platforms which incorporates tactical control, weapon/payload control and Tactical Local Area Network (TacLAN) functions into a single procurement program.

This budget line integrates software (APBs) developed by the advanced development community.

## Related program elements

- [0603561N — Advanced Submarine System Development](https://hitchintel.com/programs/0603561N) (Navy)
- [0204228N — (u)surface Support](https://hitchintel.com/programs/0204228N) (Navy)
- [0901226F — M & S Development](https://hitchintel.com/programs/0901226F) (Air Force)
- [1160405BB — Intelligence Systems Development](https://hitchintel.com/programs/1160405BB) (Defense-Wide)

## Source & machine access

- **Source:** FY2027 Department of the Navy RDT&E Budget Justification, Exhibits R-2/R-3, PE 0604562N (PB PB2027).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0604562N")`.

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