Printed from https://fiscalreceipts.com/program/0604610N/ — built September 26, 2026. Every figure is citation-backed; see the page online for per-number provenance.
Lightweight Torpedo Development
Budget figures
$12.6M discretionary + $88.2M one-time reconciliation. Discretionary change vs FY2025 enacted: -86.7%.
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 · $100.7M TOA − $12.6M J-book line = 88.2M (100.74 − 12.56 = 88.18) — $88.2M 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.
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
| Fiscal year | Amount |
|---|---|
| FY24 | $172.6M |
| FY25 | $94.5M |
| FY26 | $100.7M |
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
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.
| Series | FY15 | FY16 | FY17 | FY18 | FY19 | FY20 | FY21 | FY22 | FY23 | FY24 | FY25 | FY26 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Actuals | $39.7M | $42.5M | $29.6M | $21.1M | $62.4M | $102.1M | $113.2M | $92.3M | $131.7M | $172.6M | ||
| Enacted | $43.7M | $20.2M | $28.1M | $63.1M | $109.3M | $115.1M | $94.4M | $135.5M | $229.7M | $94.5M | ||
| Request | $20.2M | $28.1M | $95.1M | $148.3M | $146.0M | $94.4M | $142.0M | $229.7M | $137.3M | $100.7M |
blank = series not published for this year; – = absent from that edition.
Asked vs spent: the PB2024 book requested $229.7M for FY2024; the PB2026 book reported $172.6M as actual total obligation authority — $57.1M below the request. 172.6 − 229.7 = -57.1 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 — Lightweight Torpedo Development
The Lightweight Torpedo (LWT) program designs, integrates and tests the MK 54 LWT and supports an incremental developmental acquisition approach combining hardware and Advanced Processor Build (APB) operational software upgrades to enable rapid fielding of improvements to the fleet. The program will focus on common LWT hardware and software architecture enhancements that will provide improvements to the array, warhead, propulsion, and APB software to address capability gaps against challenging adversary submarines and environments. Future APB software builds will utilize common torpedo software to deliver capability and tactics improvements to the MK 54 LWT. The program will also support development of enhanced weapon delivery methods, including the high-altitude launch of the MK 54 from the P-8A Maritime Patrol and Reconnaissance Aircraft (MPRA). The HAAWC development program provides the P-8A MPRA with the ability to release LWTs from high altitude to prosecute enemy submarine threats. Operational Testing (OT) was conducted at the end of FY 2020, and the Commander Operational Test & Evaluation Force (COMOPTEVFOR) report was issued in FY 2021, recommending fielding. Follow-on T&E (FOT&E) was conducted in FY 2022 with updated flight control software and the program delivered the HAAWC capability to the fleet in Q3 FY 2022 with Commander Patrol and Reconnaissance Group (CPRG) declaring Initial Operating Capability (IOC) in Q1 FY 2023. The current HAAWC design was developed to deploy the MK 54 MOD 0/1. The MK 54 MOD 2 is not compatible with HAAWC due to having different mass properties and outer mold line from the MK 54 MOD 0/1 LWT. The HAAWC development program was cancelled due to the restructuring of the MK 54 MOD 2 program to an incremental approach. The MK 54 MOD 1 provides significant performance improvements compared to MK 54 MOD 0 for challenging littoral, shallow water environments and adversary countermeasures. The MOD 1 program is split into 2 increments: Increment 1 focusing on the updated sonar hardware and associated APB 5 common software to provide an improved LWT to the Fleet to replace the MK 54 MOD 0s; Increment 2 is the APB 6 software (SW) only upgrade to fully take advantage of the improved sonar hardware developed under Increment 1, update the platform interface to reduce Fleet Operator workload, and provide new capabilities such as Salvo, terminal homing and Hammerhead improvements. MK 54 MOD 0 weapons will also be upgraded with APB 6 improvements compatible with MOD 0 hardware. The MK 54 MOD 2 program is continuing development to provide lethality against challenging adversary submarines. The MK 54 MOD 2 development program has transitioned to an incremental approach to reduce annual costs, delivering lethality via Increment 1 (INC 1) via a Mid-Tier Acquisition process beginning in FY 2026, followed by significantly improved speed, depth and endurance via Increment 2 (INC 2). The MK 54 MOD 2 development program will complete the Phase I Proof of Design (POD) designs and award a contract funding the Rapid Prototyping of the INC 1 All-Up-Round (AUR), which combines the MOD 2 Forebody with the legacy MK 54 MOD 0/1 Afterbody. The program will continue derisking efforts for INC 2, ensuring the MOD 2 Stored Chemical Energy Propulsion System (SCEPS) Afterbody design is mature and ready for Rapid Prototyping at the commencement of the INC 2 phase.
Mission — HAAWC
The HAAWC development program was cancelled due to the restructuring of the MK 54 MOD 2 program to an incremental approach.
Mission — Lightweight Hybrid Torpedo
The program designs, integrates and tests the LWT MK 54. The LWT provides performance improvements in shallow water, counter-measure environments. The MK 54 MOD 1 program consists of two increments: (1) Increment 1 consisting of Advanced Processor Build (APB) 5 / Tech Insertion 1 (TI-1); and (2) Increment 2, consisting of APB-6 software upgrade. FY 2026 funding is for continued development of MK 54 MOD 1 Increment 2 APB 6 developmental builds, conducting in-water developmental test runs, and Weapons Analysis Facility (WAF) system testing. FY 2026 funding also for continued development of a Fleet Exercise Section (FES) instrumentation subsystem to be compatible with the MK 54 MOD 1 obsolescence upgraded hardware being produced under BLI 3215. FY 2026 also funds emergent and stop gap capability needs.
Mission — Advanced Anti-Submarine Lightweight Torpedo
The MK 54 MOD 2 program is continuing incremental development of lethality required to prosecute challenging adversary submarines. FY 2025 funding will be used to complete the POD designs, and receive delivery of the POD hardware and the Technical Data Package (TDPs), and commence development efforts of an Adapter section that enables the assembly of the MOD 2 Forebody sections with the legacy MK 54 MOD 0/1 OTTO Fuel Afterbody. FY 2026 funding will be used to award a contract to an industry Prime, funding the Rapid Prototyping of the INC 1 All-Up-Round (AUR), which combines the MOD 2 Forebody sections with the legacy OTTO Fuel Afterbody. Funding will also be used to conduct INC 1 AUR integration, which will mate POD sections, the new Adapter section, and the legacy OTTO Fuel Afterbody. The program will also continue operational software development and modeling and simulation verification, and continue derisking efforts for INC 2, ensuring the Stored Chemical Energy Propulsion System (SCEPS) Afterbody design is mature and ready for Rapid Prototyping at the commencement of the INC 2 phase.
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 | $172.6M |
| Research, Development, Test and Evaluation, Navy | N | FY25 Enacted | $94.5M |
| Research, Development, Test and Evaluation, Navy | N | FY25 Total | $94.5M |
| Research, Development, Test and Evaluation, Navy | N | FY26 Disc. Request | $12.6M |
| Research, Development, Test and Evaluation, Navy | N | FY26 Reconciliation | $88.2M |
| Research, Development, Test and Evaluation, Navy | N | FY26 Total | $100.7M |
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 | $855.7M | $172.6M | $94.5M | $12.6M | $12.6M |
| 1412: HAAWC | $22.8M | $15.1M | $0 | $0 | $0 |
| 2234: Lightweight Hybrid Torpedo | $437.2M | $14.0M | $13.4M | $12.6M | $12.6M |
| 3418: Advanced Anti-Submarine Lightweight Torpedo | $395.8M | $143.5M | $81.0M | $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
No Senate LDA lobbying filing in the tracked data mentions this program element by code or alias.
Oversight
Department-level designation (not specific to this program)
GAO lists 5 high-risk areas for DOD as a whole. That designation covers the department, not Lightweight Torpedo Development. No program-specific GAO finding for this line is in the ingested data. See the DOD oversight record.
Program dossier
No research dossier for this program — dossiers cover 50 of 1,938 programs, the largest fully J-book-detailed lines by FY2026 requested dollars. why no dossier here? →
Primary sources
Open any budget figure for its exact receipt. Verified line items lead with the highlighted government PDF; original spreadsheets download with their budget edition and exhibit in the filename.
Budget totals · TOA sources
FY2026 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J389
Complete workbook · unchanged saved copy. Saves as PB2026_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2017 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J340
Complete workbook · unchanged saved copy. Saves as PB2017_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2018 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J370
Complete workbook · unchanged saved copy. Saves as PB2018_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2019 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J381
Complete workbook · unchanged saved copy. Saves as PB2019_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2020 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J393
Complete workbook · unchanged saved copy. Saves as PB2020_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2021 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J404
Complete workbook · unchanged saved copy. Saves as PB2021_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2022 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J378
Complete workbook · unchanged saved copy. Saves as PB2022_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2023 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J369
Complete workbook · unchanged saved copy. Saves as PB2023_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2024 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J368
Complete workbook · unchanged saved copy. Saves as PB2024_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
FY2025 Department of Defense Budget: RDT&E Programs (R-1) · comptroller.war.gov
Exhibit R-1 · J370
Complete workbook · unchanged saved copy. Saves as PB2025_DoD_R-1_Research-Development-Test-Evaluation.xlsx.
Detailed budget justification
The related TOA spreadsheets above use a different accounting basis from R-2/P-40 detail. Their amounts are not assumed to match these detailed sources.
RDTEN BA1-3 Book · www.secnav.navy.mil