Submarine Tactical Warfare System

NavyRDT&EPartial Reconciliation0604562N

What it is

Submarine Tactical Warfare System (0604562N) is a Navy research & development line funded in the Research, Development, Test and Evaluation, Navy account. Its J-book detail breaks the line into 1 project.

What changed

No FY25→26 comparison — endpoints unavailable or on different bases.

Who gets it

No award linkage at high confidence.

Budget Figures

FY24 Actuals

$69.7MR-1 TOA · PB2026

FY25 Total

$72.0MR-1 TOA · PB2026

FY26 Request

$0P-40 detail · PB2026

FY25→26 Change

No comparison: endpoints unavailable or on different bases

FY2026 award data is a partial year — USASpending awards are reported on a rolling basis and the fiscal year does not close until September 30. why partial FY2026 data? →

Budget Trajectory

The program's 3 summary figures for FY24 to FY26, plotted in fiscal-year order so the direction of travel is readable at a glance: this line ends lower than it starts. The points are the summary cards above, not a separate derivation; the table beside the chart carries each figure with its own citation.

Budget trajectory: one row per fiscal year, carrying the summary figure the sparkline plots. Every figure opens its own citation.
Fiscal year	Amount
FY24	$69.7MR-1 TOA · PB2026
FY25	$72.0MR-1 TOA · PB2026
FY26	$0P-40 detail · PB2026

Decade view — P-1/R-1 workbook TOA basis, shown compact in $B/$M (the workbook records USD thousands); each figure cites its own President's Budget edition

11 fiscal years of this program as published (FY2015–FY2025): a line through the actuals (filled dots), with the enacted (hollow circles) and request (diamonds) markers each edition reported. Read it for direction, not for precision — this program's actuals line rises across the span. The grid below is the same data as text, one cited figure per cell.

The vertical scale does not start at zero: the baseline sits just below this program’s smallest year, so a low point on this line is not a small amount. Read the shape for direction and the grid below for the figures.

● actuals (line) · ○ enacted · ◇ request — gaps are editions the program is absent from, never interpolated.

Decade series values by fiscal year and President's Budget edition: one row per series (actuals, enacted, request), one column per fiscal year. Every figure opens its own citation.
Series	FY15	FY16	FY17	FY18	FY19	FY20	FY21	FY22	FY23	FY24	FY25
Actuals	$37.8M	$51.1M	$50.1M	$44.7M	$77.5M	$60.8M	$69.4M	$60.8M	$57.5M	$69.7M
Enacted		$52.7M	$43.2M	$50.9M	$80.3M	$62.4M	$71.1M	$62.1M	$58.7M	$71.5M	$72.0M
Request			$43.2M	$50.9M	$60.8M	$62.4M	$63.9M	$62.1M	$58.7M	$71.5M	$72.0M

blank = series not published for this year; – = absent from that edition.

Asked vs spent: the PB2019 book requested $60.8M for FY2019; the PB2021 book reported $77.5M as actual total obligation authority — $16.7M above the request. 77.5 − 60.8 = 16.7 USD millions — the compact figures above are rounded for reading.

Program Lineage

No predecessor/successor lineage was recorded for this program element — no FY-to-FY transfer into or out of this line was stated in the ingested J-books, and none was inferred from the program structure.

Description

Mission — Submarine Tactical Warfare System

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. 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 (IA) 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.

Mission — 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. FY26 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 continue in FY26.

Justification

No accomplishments or planned-program narratives in this line's J-book detail — some exhibits carry figures without per-project prose.

Budget Line Items(workbook-cited)

P-1/R-1 workbook Total Obligation Authority basis (USD thousands) · PB2026.

Exhibit R-1

Account	Org	Type	Amount
Research, Development, Test and Evaluation, Navy	N	FY24 Actuals	$69.7M
Research, Development, Test and Evaluation, Navy	N	FY25 Enacted	$72.0M
Research, Development, Test and Evaluation, Navy	N	FY25 Total	$72.0M

Budget Details(R-2/P-40 facts)

J-book detail basis (R-2/P-40, USD millions) · PB2026 — a different accounting basis from the P-1/R-1 workbook TOA above; where the two disagree, the reconciliation strip under Budget Figures shows both.

Wider than this screen — swipe the table sideways for the remaining fiscal-year columns.

Project	All Prior Years	FY24 Actuals	FY25 Total	FY26 Base	FY26 Request
Program Element	$919.4M	$69.7M	$72.0M	$0	$0
0236: SSN Comb Cont Sys Imprvmnt (ENG)	$919.4M	$69.7M	$72.0M	$0	$0

No follow-the-dollar view — this program's awards haven't been crosswalked at high confidence (flows cover 17 of 1,741 programs). why coverage is partial? →

Awards

No awards are linked to this program element at high confidence — the budget→award crosswalk only asserts links it can defend, and this line has none yet.

Lobbying Mentions

20 mentions from the Senate LDA disclosure database.

BAE SYSTEMS INCSubmarine|Warfare2026matched 2+ title words

National Defense Authorization Act, 2027 (HR XXXX/S XXXX); provisions regarding R&D - Navy, US Marine Corps, Air…