# Ship-Towed Array Surveillance Systems — Program Element 0204313N

**Program element:** 0204313N  
**Component:** U.S. Navy  
**Appropriation:** 1319 — RDT&E, Navy  
**Budget Activity:** 7 — Operational System Development  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0204313N

## Summary

U.S. Navy funding falls 52% to a $1.0M 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.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 1.4 |
| FY2026 | Enacted | 2.0 |
| FY2027 | Request | 1.0 |
| FY2028 | Outyear | 1.0 |
| FY2029 | Outyear | 5.0 |
| FY2030 | Outyear | 2.4 |
| FY2031 | Outyear | 2.4 |

> Estimate types are not summed — the profile mixes actuals, enacted law, the request, and outyear projections.

## Congressional marks (FY2027)

| Stage | Marked ($M) | Change ($M) |
|---|---|---|
| Request | 1.0 | — |
| House NDAA (HASC) | 1.0 | +0.0 |
| Senate NDAA (SASC) | 1.0 | +0.0 |
| House Approps (HAC-D) | 1.0 | +0.0 |

> FY2027 NDAA authorization marks, as of 2026-07-27. Not appropriations or final law.

## Projects (1)

| Project | Title | FY2025 actual | FY2026 enacted | FY2027 request | Move |
|---|---|---|---|---|---|
| 3261 | TAGOS Design & Total Ship Integration | 1.4 | 2.0 | 1.0 | −52% |

> Projects are the summable leaves: the program element total is their sum, never added to it.

### Project 3261 — TAGOS Design & Total Ship Integration

T-AGOS are ocean surveillance ships that gather underwater acoustical data to support the mission of the Integrated Undersea Surveillance System (IUSS) by providing a ship platform capable of theater anti-submarine acoustic passive and active surveillance. Auxiliary General Ocean Surveillance Ships (T-AGOS) are operated by Military Sealift Command to support the anti-submarine warfare mission of the commanders of the Atlantic and Pacific Fleets. The two current classes of surveillance ships use Surveillance Towed-Array Sensor System (SURTASS) equipment to gather undersea acoustic data. The ships also carry electronic equipment to process and transmit that data via satellite to shore stations for evaluation. Funding will support recapitalization of the four Small Waterplane Area Twin Hull (SWATH) T-19 Class and one SWATH T-23 Class.

| Activity (R-2A) | FY2025 | FY2026 | FY2027 |
|---|---|---|---|
| T-AGOS 25 Class Design & Total Ship Integration | 1.4 | 2.0 | 1.0 |

> R-2A activities carry the prior, current and budget year only — no five-year plan. Coverage is partial, so count them, never total them.

## Where the FY2027 request goes

| Category | Share | $M |
|---|---|---|
| Other / unspecified | 100% | 1.0 |

> R-3 exhibit contract funding, not USAspending obligations.

## Mission & acquisition strategy

T-AGOS are Ocean surveillance ships that gather underwater acoustical data to support the Integrated Undersea Surveillance System (IUSS) mission by providing a ship platform capable of theater anti-submarine passive and active acoustic surveillance. T-AGOS ships are operated by Military Sealift Command (MSC) to support the anti-submarine warfare (ASW) mission of Atlantic and Pacific Fleet Commanders. Both classes of T-AGOS ships use the Surveillance Towed-Array Sensor System (SURTASS) to gather undersea acoustic data. They also carry electronic equipment to process and transmit that data via satellite to shore stations for evaluation.

Issued Request For Proposal (RFP) for industry studies and awarded in FY 2020. Issued RFP for Detail Design and Construction (DD&C) in FY 2022. Awarded Detail Design for the T-AGOS 25 Class in FY 2023 with the option for the Lead Hull's construction, and six follow-on ships. Awarded the option for continuing the Detail Design of the Lead Hull in May 2024.

## Related program elements

- [0204311N — Integrated Surveillance System](https://hitchintel.com/programs/0204311N) (Navy)
- [0604601N — Mine Development](https://hitchintel.com/programs/0604601N) (Navy)
- [0603907C — Sea Based X-Band Radar (SBX)](https://hitchintel.com/programs/0603907C) (Defense-Wide)
- [1160483BB — Maritime Systems](https://hitchintel.com/programs/1160483BB) (Defense-Wide)

## Source & machine access

- **Source:** FY2027 Department of the Navy RDT&E Budget Justification, Exhibits R-2/R-3, PE 0204313N (PB PB2027); FY2027 NDAA committee marks (as of 2026-07-27).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0204313N")`.

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