# SOF Combat Diving (CBDIV)

**R-2A activity** of project S0417 — Underwater Systems  
**Program element:** 1160483BB — Maritime Systems  
**Component:** Defense-Wide · **Budget Activity:** 7  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/1160483BB/S0417/a2  
**Parent:** https://hitchintel.com/programs/1160483BB/S0417

> **RESTART.** Funded in FY2025 ($11.3M), zeroed in FY2026, $12.1M requested again in FY2027.

## Summary

This activity requests $12.1M in FY2027, 4.2% of project S0417 — a restart, funded in FY2025 and zeroed in FY2026. The R-2A exhibit describes it across FY2025–FY2027, including what the FY2027 money is planned to buy.

## What the FY2027 request buys

**FY2027 planned work.** Continues extended table development. Finalizes testing of next collective propulsion device and acoustic communications devices. Continues testing of A/O communications devices and finalizes testing of next collective propulsion device. Begins development of Expeditionary Diver Treatment System and Submarine Lock Out Trunk trainer.

**FY2026 to FY2027 change.** Increase of $12.088 million continues extended table development, testing of next collective propulsion device and acoustic communications devices, testing of A/O communications devices and next collective propulsion device. Begins development of Expeditionary Diver Treatment System and Submarine Lock Out Trunk trainer.

## Before the request year

**FY2026 plans — current year.** Begin extended table development, both in depth and duration, testing and development of next generation diver navigation equipment, next generation propulsion devices, SO-p Lock In/Out (LIO) deep diving Underwater Breathing Apparatus, and continues development and integration of communications devices for both acoustic and optical. Note: FY 2026 President's Budget included $0.00 million in discretionary funding and $27.764 million in mandatory funding for CBDIV.

**FY2025 accomplishments.** Continue development, prototyping and the advancement of Engineering Development Model (EDM), testing and rapid prototyping of new SO-p underwater mixed gas breathing apparatus and the development of associated diving procedures specific to SO-p capabilities. Development of emergency breathing systems and diving treatment systems supporting the SO-p diving deployment from USSOCOM maritime platforms, next generation diver propulsive equipment with integrated thermal protection increasing range and duration in the water, development of underwater communications networks of diver-to-diver communications, and optical and acoustic communication systems of a new mixed gas underwater breathing apparatus (UBA).

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 11.3 |
| FY2026 | Enacted | 0.0 |
| FY2027 | Request | 12.1 |

> Prior, current and budget year only — an R-2A activity carries no five-year plan. It sums exactly into its project in the request year and not necessarily in any other.

## Other activities in project S0417

- Classified Programs — FY2027 248.3
- [Undersea Craft Mission Equipment (UCME)](https://hitchintel.com/programs/1160483BB/S0417/a3) — FY2027 13.2
- Dry Deck Shelter (DDS) Modernization, Program Number 817 — FY2027 5.0
- Sea, Air, and Land (SEAL) Delivery Vehicle (SDV), Program Number 848 — FY2027 5.0
- Small Unmanned Surface Vehicle (SUSV), Program Number V36 — FY2027 2.0
- Small Unmanned Underwater Vehicle (SUUV), Program Number 799 — FY2027 1.4

## Source & machine access

- **Source:** FY2027 Office of the Secretary of Defense RDT&E Budget Justification, Exhibit R-2A, PE 1160483BB project S0417 (PB PB2027). Narrative is the government's own text.
- **No marks, no contractors at this grain** — congressional marks land on the program element and R-3 performers on the project.
- **MCP:** `mcp.hitchintel.com` — `budget_get_activity`.

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