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

**Program element:** 0604503N — Submarine SWFTS Modernization  
**Project:** 0236  
**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/0604503N/0236  
**Parent:** https://hitchintel.com/programs/0604503N

## Summary

Project 0236 — SSN Comb Cont Sys Imprvmnt (ENG) requests $62.1M in FY2027, 32% of the $195.4M requested for program element 0604503N, down 1.8% on FY2026. 5 R-2A activities decompose the request. General Dynamics is the largest named R-3 performer at $45.9M, 74% of the project's FY2027 R-3 total.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 0.0 |
| FY2026 | Enacted | 63.2 |
| FY2027 | Request | 62.1 |
| FY2028 | Outyear | 68.7 |
| FY2029 | Outyear | 70.6 |
| FY2030 | Outyear | 67.3 |
| FY2031 | Outyear | 68.7 |

> Estimate types are not summed. This project is one leaf of PE 0604503N; the PE total is the sum of its projects, never added to them.

## What project 0236 buys

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. TacLAN provides the infrastructure for connectivity within AN/BYG-1 as well as connectivity to other subsystems attached to TacLAN. It is a local area network backbone for tactical systems on a submarine, including a link to radio for communications off-hull. It enables a submarine to share a common operational picture among systems aboard, and with external platforms. Modifications and improvements to TacLAN are necessary to enable new capabilities requiring network connectivity on BYG-1 and other tactical systems and to improve the submarine's cyber security posture. New capabilities to the Information Assurance (IA) subsystem enhance the centralized solution for cyber security (inclusive of antivirus, access control, intrusion detection and more) and classified information protection (inclusive of posture transition, system downgrade, cross domain solutions and more) onboard all submarines. Modifications to IA are necessary to enable new capabilities on other tactical submarine systems.

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

## Named R-3 performers

| Performer | $M | Share of this project's FY2027 R-3 total |
|---|---|---|
| General Dynamics | 45.9 | 74% |
| COMOPTEVFOR | 0.9 | 1.4% |

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

## Activities (R-2A) — 5

| Activity | FY2025 | FY2026 | FY2027 | Move | Page |
|---|---|---|---|---|---|
| AN/BYG-1 Software Development | 0.0 | 26.7 | 24.6 | −8% | — |
| AN/BYG-1 Hardware Development | 0.0 | 15.7 | 15.2 | −3% | — |
| Payload Development and Test | 0.0 | 10.8 | 10.9 | +1% | [a3](https://hitchintel.com/programs/0604503N/0236/a3) |
| CyberSecurity | 0.0 | 6.5 | 7.8 | +20% | — |
| Testing | 0.0 | 3.4 | 3.5 | +2% | — |

> 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.

### AN/BYG-1 Software Development

**FY2027 planned work.** Continue development of TI-24/APB-25 and TI-26.

**FY2026 to FY2027 change.** The $2.139M decrease in funding in FY 2027 is a result of de-scoping previously planned system improvements.

**FY2026 plans — current year.** Complete development of TI-24/APB-23 and continue development of TI-24/APB-25. Commence development of TI-26.

### AN/BYG-1 Hardware Development

**FY2027 planned work.** Continue development, integration and test of AN/BYG-1 TI-26 and AN/BYG-1 TI-28.

**FY2026 to FY2027 change.** The $0.434M decrease is a result of de-scoping previously planned system improvements.

**FY2026 plans — current year.** Continue development, integration and test of AN/BYG-1 TI-26.

### Payload Development and Test

Continue software development efforts to support submarine payload integration of MK 48 Advanced Capability (ADCAP) torpedo variants Mod 8 and 9. Continue development and test of payload capabilities that have been integrated into the Payload Control System to include CRAW, Harpoon, future countermeasures, and classified payloads.

Full year-by-year narrative: https://hitchintel.com/programs/0604503N/0236/a3

### CyberSecurity

**FY2027 planned work.** Complete development of CyberSecurity Toolkit and IA Certification Testing on BYG-1 TI-24. Continue TI-26 feature development and Cyber requirements definition. Continue Risk Management Framework (RMF) accreditations for various sub-systems.

**FY2026 to FY2027 change.** The $1.282M increase is to support re-instituting cyber capability development and improvements to the Information Assurance (IA) sub-system.

**FY2026 plans — current year.** Complete development of CyberSecurity Toolkit and IA Certification Testing on BYG-1 TI-24. Continue TI26 feature development and Cyber requirements definition. Continue RMF accreditations for various systems.

### Testing

**FY2027 planned work.** Complete APB-25 DT (payload and rearchitecture build) with new longevity test plans. Commence APB-25 OT.

**FY2026 to FY2027 change.** Increase by $0.069M due to inflation.

**FY2026 plans — current year.** Complete APB-21 OT and APB-23 DT. Commence APB-23 OT and APB-25 DT.

## 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/0604503N.

## Source & machine access

- **Source:** FY2027 Department of the Navy RDT&E Budget Justification, Exhibits R-2/R-2A/R-3, PE 0604503N project 0236 (PB PB2027).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0604503N")`.

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