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RDT&E Program Element · President's Budget PB2027

Surface Ship Torpedo Defense

PE 0603506N·U.S. Navy·Approp. 1319 — RDT&E·BA4 — Advanced Component Development & Prototypes
FY2027 Request
$9.9M
Navy · RDT&E
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U.S. Navy funding falls 16% to a $9.9M request in FY2027, sustained across the five-year plan. In the FY2027 defense authorization, the House funded it in full; the Senate funded it in full; House appropriators funded it in full. Sonalyst leads the industry work, though an unusually large share flows to government labs and warfare centers.

FY2027 Request
$9.9M
▼ 16% vs FY2026
FY2026 Enacted
$11.8M
▲ 155% vs FY2025
FY2025 Actual
$4.6M
Prior year

For fiscal year 2027, the U.S. Navy is requesting $9.9M for Surface Ship Torpedo Defense under RDT&E program element 0603506N, down 16% from FY2026.

Funding trajectory

Funding profile, FY2025–FY2031

Prior years are actuals, the budget year is the request, and the outyears are the FYDP plan. Estimate types are colored and never summed into one figure.

2504.6FY25ACTUAL11.8FY26ENACTED9.9FY27REQUEST25.8FY2828.1FY2940.7FY3041.4FY31
Actual Enacted Request Outyear (FYDP)
Fiscal YearEstimate TypeAmount ($M)
FY2025Actual4.6
FY2026Enacted11.8
FY2027Request9.9
FY2028Outyear25.8
FY2029Outyear28.1
FY2030Outyear40.7
FY2031Outyear41.4
Where it sits

Acquisition lifecycle

This program is funded in RDT&E Budget Activity 4 — Advanced Component Development & Prototypes.

Complete
Research
BA 1–2
Complete
Advanced Technology
BA 3
Current
Prototyping
BA 4
Later
Development & Fielding
BA 5–7
Inside the program element

1 project rolls up into PE 0603506N

Projects are the summable leaves — the PE total is their sum, never added to it. Program elements and projects carry the full five-year plan; activities stop at the budget year. This PE moves -16% overall, which can hide much larger swings below.

Project 0225

Surface Ship Torpedo Defense (SSTD)

$9.9MFY2027 request ▼ 16%
FY2025 actual$4.6M
FY2026 enacted$11.8M
FY2027 request$9.9M
Product DevelopmentManagement Services

Anti-Torpedo Torpedo Defensive System (ATTDS) is a system of systems, comprised of the TWS and the CAT planned to develop NIXIE HK new AN/SLQ-25 capabilities in order to pace the torpedo threat. This includes integrating and testing a kinematics-based target discrimination and fire control into the AN/SLQ-25E, improving existing soft kill capabilities within AN/SLQ-25E, and adding a hard kill capability with a launcher for the MK 58 CRAW and the (ADC) MK5 and MK 2 Mod 6/8. The funds support the development of a torpedo alertment and fire control capability integrated into the AN/SLQ-25E tow system in support of a torpedo defense requirements along with software improvements to specific NIXIE counter measures.

Accomplishments / planned programs (R-2A) — prior, current and budget year only
Torpedo Warning System (TWS)▼ 61%
FY2025 actual$4.6M
FY2026 enacted$2.4M
FY2027 request$0.9M

FY2027 planned work - Continue the TWS Sustainment for CVNs

FY2026 to FY2027 change Funding decrease from FY 2026 to FY 2027 by $1.469M due to the TWS DEMIL effort shifting from scheduled FY 2027 to FY 2030

FY2026 plans — current year - Continue the TWS Sustainment for CVNs

SLQ-25 (NIXIE) Capability Improvementsflat
FY2025 actual$0.0M
FY2026 enacted$1.3M
FY2027 request$1.3M

FY2027 planned work - Continued NIXIE HK Torpedo Alertment and Fire Control - Systems Engineering: Continue Software Development Spirals - Systems Engineering: Continue development and qualification of NIXIE system

FY2026 plans — current year - Increase NIXIE system capability through software development and software testing. - Support NIXIE system component development to meet NIXIE HK requirements.

Torpedo Hardkill Development▼ 5%
FY2025 actual$0.0M
FY2026 enacted$8.1M
FY2027 request$7.7M

FY2027 planned work - Continue systems engineering, requirements development, and prototyping for NIXIE 25E upgrades. - Systems engineering / development requirements for NIXIE HK Launcher. - Continue Systems Engineering / Development of ATT

FY2026 to FY2027 change Funding decrease from FY 2026 to FY 2027 of $0.443M continues to support the NIXIE HK prototype testing At-Sea in FY 2027

FY2026 plans — current year - Develop requirements for torpedo alertment and solutions development capability into the NIXIE 25E tow system. - Develop and test an increased capability NIXIE 25E winch. - Develop and test SW enhancements to the NIXIE 25E system

The whole program

SSTD is funded on 3 lines across 3 appropriations

This page shows $9.9M of SSTD, 35% of the program's $28.7M FY2027 request. The rest is appropriated elsewhere.

Also funded hereTypeComponentFY2027 $M
Surface Ship Torpedo Def (SSTD)ProcurementNavy14.9
Surface Ship Torpedo Def (SSTD)ProcurementNavy4.0
SSTD totalNavy28.7

Lines whose title names the program. 1 further lines only mention SSTD in their justification text — those fund something else and are deliberately excluded from the total.

Congressional action

Congressional marks

Committee marks on the FY2027 request. Adds and cuts are reconciled in conference before they become law.

RequestPresident's Budget
$9.9M
House NDAA (HASC)HASC
$9.9M full · +$0
Senate NDAA (SASC)SASC
$9.9M full · +$0
House Approps (HAC-D)HAC_D
$9.9M full · +$0
unresolved as of 2026-07-27. These are FY2027 authorization marks (NDAA); appropriations and the conference agreement may differ.
Who's building it

Where the FY2027 request goes

Performers named in the R-3 exhibit, resolved into industry, government-lab, and unspecified shares. Budget-justification contract funding, not obligations.

Sonalyst
$1.1M · 11%
Program Management Support
SAIC
$0.4M · 4.4%
Systems Engineering - NIXIE Capability Improvement · CPFF
Where FY2027 funding flowsShare$M
Industry primes21%2.1
Government labs & warfare centers30%3.0
Other / unspecified49%4.8
FY2027 request100%9.9
See Sonalyst's full federal contract ledger members →
Program detail

Mission & acquisition strategy

The Surface Ship Torpedo Defense (SSTD) program provides a detect-to-engage layered torpedo defense capability. The four (4) major efforts that comprise SSTD are the AN/SLQ-25 (NIXIE) system, Torpedo Warning System (TWS), the Countermeasure Anti-Torpedo (CAT), and Acoustic Device Countermeasure (Surface ADC MK2). A layered torpedo defense to protect surface ships against current and future threats. SSTD development will include a new anti-torpedo Hard Kill (HK) capability by pairing proven technology and the MK 58 the Compact Rapid Attack Weapon (CRAW) with improved AN/SLQ-25E that has additional software capabilities.

Torpedo Warning System (TWS) Program: ULTRA developed and produced five complete sensor sets. Pacific Engineering Incorporated (PEI) and In-Depth Engineering INC. developed the stowage racks and fire control systems respectively. System integration supported fabrication and fielding of the five complete systems. Testing of TWS SALVO software was complete and is currently in Fleet use. ULTRA continues to provide Fleet support for the system. AN/SLO-25E NIXIE Torpedo Hardkill Program will leverage the technologies developed in the TWS and CAT then incorporates them into the tow system and CRAW of the NIXIE 25E system.

Project 0225 — Surface Ship Torpedo Defense (SSTD)
  • Product Development
  • Management Services
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Answers are generated from the figures on this page — the FY2027 justification exhibits and the marks tracked above — and nothing else is consulted. Confirm any figure against the cited exhibit before you use it externally.

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This page carries the budget justification and the NDAA marks — nothing else. For what Sonalyst has actually been obligated, the ledger is at hitchintel.com/vendors; for live solicitations, hitchintel.com/opportunities. Both are member surfaces.

Provenance

Cite this page

Sources
FY2027 Department of the Navy RDT&E Budget Justification · Exhibits R-2 / R-3 · PE 0603506N (President's Budget PB2027) — and FY2027 NDAA committee marks, as tracked 2026-07-27.
Suggested citation
HitchAI, "Surface Ship Torpedo Defense (PE 0603506N)," federal budget intelligence, PB2027 vintage. hitchintel.com/programs/0603506N
Machine access
Markdown twin /programs/0603506N.md · MCP mcp.hitchintel.com → budget_get_program_element, budget_get_cong_marks