Large Unmanned Undersea Vehicles (PE 0604031N) · Navy

What it is

Large Unmanned Undersea Vehicles (0604031N) is a Navy research & development line funded in the Research, Development, Test and Evaluation, Navy account. Its J-book detail breaks the line into 2 projects.

What changed

+$178.1M FY25→26 R-1 TOA · PB2026

Who gets it

No company is linked to this line. Award records do not carry the program element, so the crosswalk is silent here — why.

Budget figures

FY24 Actuals

$40.5MR-1 TOA · PB2026

FY25 Total

$6.87MR-1 TOA · PB2026

FY26 Request

$185.0MR-1 TOA · PB2026

100.0% reconciliation

$185.0M one-time reconciliation. Discretionary change vs FY2025 enacted: -100.0%.

FY25→26 Change

+$178.1MR-1 TOA · PB2026

Two official figures, one label— reconciled below

Fiscal Receipts uses P-1/R-1 workbook total obligation authority (TOA) as the headline figure sitewide. The workbook TOA includes budget rows that the R-2/P-40 J-book program line excludes — advance procurement in an ordinary year, and in FY2026 the one-time reconciliation appropriation as well. Each row below names the one it is. How the two bases relate →

FY26 Request · $185.0M TOA − $0 J-book line (a zero-dollar XML line) = 185.0M (185.0 − 0.0 = 185.0) — $185.0M of one-time FY2026 reconciliation money accounts for this gap — not advance procurement

Figures in the sentence are rounded for reading; the parenthesised arithmetic is the same subtraction in USD millions, at the precision where it closes.

Data coverage

FY2026 award data is a partial year — USAspending reports awards on a rolling basis, and this corpus runs through 2026-09-04. why partial FY2026 data? →

Budget trajectory

The program's 3 summary figures for FY24 to FY26, plotted in fiscal-year order: this line ends higher 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	$40.5M
FY25	$6.87M
FY26	$185.0M

All series figures: R-1 TOA · 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

10 fiscal years of this program as published (FY2017–FY2026): 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, and 1 year is a break in the line rather than a low value: an edition the program is absent from, never interpolated. 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	FY17	FY18	FY19	FY20	FY21	FY22	FY23	FY24	FY25	FY26
Actuals	$0	$23.9M	$57.9M	$66.7M	$60.4M	$27.5M	–	$40.5M
Enacted	–	$0	$60.3M	$68.3M	$62.2M	$65.7M	$0	$6.90M	$6.87M
Request	–	–	$92.6M	$68.3M	$78.1M	$88.1M	$0	$6.90M	$6.87M	$185.0M

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

Asked vs spent: the PB2022 book requested $88.1M for FY2022; the PB2024 book reported $27.5M as actual total obligation authority — $60.6M below the request. 27.5 − 88.1 = -60.6 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 — Large Unmanned Undersea Vehicles

Large Unmanned Undersea Vehicles (UUVs) are part of the Navy's family of UUVs, in support of maintaining the Navy's undersea superiority. They are designed with mission sensors, communications, power, navigation, autonomy and target recognition, and payloads. Large UUVs provide the Navy with significantly increased endurance and payload capacity over small and medium class UUVs. They are deployed from vessels of opportunity and piers. The Snakehead Program was intended to be Navy's largest Submarine-launched UUV with a modular design, high accuracy mission sensors and communications links, as well as modular payload capabilities with well-defined interfaces for the purpose of implementing cost-effective upgrades in future increments to leverage advances in technology. The Snakehead LDUUV program was a CNO/ASN(RDA) approved Accelerated Acquisition that had a phased approach to grow capabilities at a manageable level of risk. As part of Phase I, a Government developed prototype was fabricated, subsystem-level testing began in FY 2021, and vehicle in-water testing began in FY 2022. Phase 2 efforts were stopped in FY 2022. The Snakehead Program is cancelled, starting in FY 2026. The Dragonfish LUUV is a rapid and iterative prototyping project that addresses a priority Fleet requirement for a below-water Intelligence, Surveillance, and Reconnaissance (ISR) task with classification of targets of interest and activation of a purpose-built payload. The system consists of a vehicle, a payload, and a support system. The Dragonfish LUUV is a follow-on effort to a Defense Innovation Unit (DIU) Commercial Solutions Opening (CSO) that assessed commercially available LUUVs. The project is rapidly prototyping with V1 vehicles and conducting in-water, system-level testing. This will inform prototyping for V2 vehicles, which are intended to be Minimal Viable Products (MVPs).

Mission — Unmanned Underwater Vehicle

The Snakehead Program was intended to be Navy's largest Submarine-launched UUV with a modular design, high accuracy mission sensors and communications links, as well as modular payload capabilities with well-defined interfaces for the purpose of implementing cost-effective upgrades in future increments to leverage advances in technology. The Snakehead LDUUV program was a CNO/ASN(RDA) approved Accelerated Acquisition that had a phased approach to grow capabilities at a manageable level of risk. As part of Phase I, a Government developed prototype was fabricated, subsystem-level testing began in FY 2021, and vehicle in-water testing began in FY 2022. Phase 2 efforts were stopped in FY 2022. The Snakehead Program is cancelled, starting in FY 2026. The Dragonfish LUUV is a rapid and iterative prototyping project that addresses a priority Fleet requirement for a below-water Intelligence, Surveillance, and Reconnaissance (ISR) task with classification of targets of interest and activation of a purpose-built payload. The system consists of a vehicle, a payload, and a support system. The Dragonfish LUUV is a follow-on effort to a Defense Innovation Unit (DIU) Commercial Solutions Opening (CSO) that assessed commercially available LUUVs. The project is rapidly prototyping with V1 vehicles and conducting in-water, system-level testing. This will inform prototyping for V2 vehicles, which are intended to be Minimal Viable Products (MVPs).

Mission — Congressional Adds

(U) Congressional Add for Commercially Available Long Endurance UUV - acquire, prototype, and experiment with commercially available Large Diameter Unmanned Undersea Vehicle (LDUUV) test platforms, ancillary equipment, and support services that can rapidly integrate a broad range of payloads and sensors to serve as test beds for organizations and expedite the delivery of these capabilities to the fleet.

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	$40.5M
Research, Development, Test and Evaluation, Navy	N	FY25 Enacted	$6.87M
Research, Development, Test and Evaluation, Navy	N	FY25 Total	$6.87M
Research, Development, Test and Evaluation, Navy	N	FY26 Reconciliation	$185.0M
Research, Development, Test and Evaluation, Navy	N	FY26 Total	$185.0M

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	$236.2M	$40.5M	$6.87M	$0	$0
2094: Unmanned Underwater Vehicle	$236.2M	$6.72M	$6.87M	$0	$0
9999: Congressional Adds	$0	$33.8M	$0	$0	$0

Follow the dollar

No follow-the-dollar view — this program's awards haven't been crosswalked at high confidence (flows cover 312 of 1,938 programs). why coverage is partial? →

Awards

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

Lobbying mentions

Showing 25 of 72 from the Senate LDA disclosure database.

BAE SYSTEMS INCUnmanned|Vehicles2026matched 2+ title words

National Defense Authorization Act, 2027 (HR 8800/S 4784); provisions regarding R&D - Navy, US Marine Corps, Air…

Large Unmanned Undersea Vehicles

Budget figures

Budget trajectory

Decade view

Program lineage

Description

Mission — Large Unmanned Undersea Vehicles source

Mission — Unmanned Underwater Vehicle source

Mission — Congressional Adds source

Justification

Budget line items(workbook-cited)

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

Follow the dollar

Awards

Lobbying mentions

Oversight

Program dossier

Primary sources

Budget totals · TOA sources

Detailed budget justification

Mission — Large Unmanned Undersea Vehicles

Mission — Unmanned Underwater Vehicle

Mission — Congressional Adds