# Small Diameter Bomb (SDB) — Program Element 0604329N

**Program element:** 0604329N  
**Component:** U.S. Navy  
**Appropriation:** 1319 — RDT&E, Navy  
**Budget Activity:** 5 — System Development & Demonstration  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0604329N

## Summary

U.S. Navy funding ramps 170% to a $64.4M request in FY2027 — the program's peak, before stepping down 85% across the five-year plan. In the FY2027 defense authorization, the House funded it in full; the Senate funded it in full; House appropriators cut 16% (to $54.3M). Boeing leads the industry work.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 21.2 |
| FY2026 | Enacted | 23.8 |
| FY2027 | Request | 64.4 |
| FY2028 | Outyear | 17.4 |
| FY2029 | Outyear | 10.2 |
| FY2030 | Outyear | 9.8 |
| FY2031 | Outyear | 9.9 |

> 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 | 64.4 | — |
| House NDAA (HASC) | 64.4 | +0.0 |
| Senate NDAA (SASC) | 64.4 | +0.0 |
| House Approps (HAC-D) | 54.3 | −10.1 |

> 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 |
|---|---|---|---|---|---|
| 3072 | Small Diameter Bomb (SDB) | 21.2 | 23.8 | 64.4 | +170% |

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

### Project 3072 — Small Diameter Bomb (SDB)

Small Diameter Bomb Increment II (SDB II) is an ACAT 1C joint Department of the Air Force (USAF) and Department of the Navy (DON) program, with the USAF as the lead service. The SDB II increases joint lethality in contested environments. The SDB II can strike a diverse set of targets inside an adversary's air and missile defense networks to destroy mobile platforms through the weather. With increased loadout, range, and munitions effect the network enabled SDB II enhances close combat lethality in complex terrain and provides a net-centric operations capability. BRU-61C/A is a modification of the USAF BRU-61B/A upgraded for DON and F-35 environmental requirements. The BRU-61C/A is Universal Armament Interface (UAI) capable, pneumatic rack capable of carrying four SDB II's at once. The threshold aircraft for the USAF is the F-15E, and for the DON F-35B and F-35C. This Project Unit includes all funding associated with integration on the DoN threshold platforms, F-35B and F-35C. This includes the integration of the SDB II weapon with BRU-61C/A rack on the F-35B&C, modification to the USAF BRU-61 four-place bomb rack for F-35 and DoN shipboard environments, the integration of the Universal Armament Interface (UAI) software into the F-35 Operational Flight Program (OFP), test asset procurement, flight testing, logistics and associated software updates for the SDB II weapon system. Internal carriage is being integrated and tested to support F-35 Initial Operational Capability (IOC). BRU-61C/A integration on the F/A-18E/F will begin after F-35 integration is complete.

**Named R-3 performers** (share of this project's FY2027 R-3 total, so they need not reach 100%)**:** Boeing (22.3, 35%), Lockheed Martin (20.6, 32%), NAWC WD (14.8, 23%), RTX / Raytheon (2.1, 3.3%).

| Activity (R-2A) | FY2025 | FY2026 | FY2027 |
|---|---|---|---|
| SDB II Weapon Support | 19.2 | 17.8 | 43.8 |
| JSF Integration | 2.1 | 6.0 | 20.6 |

> 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 |
|---|---|---|
| Industry primes | 93% | 59.8 |
| Other / unspecified | 7.2% | 4.7 |

**Top named industry performers:** Boeing ($22.3M, 35%), Lockheed Martin ($20.6M, 32%), NAWC WD ($14.8M, 23%), RTX / Raytheon ($2.1M, 3.3%).

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

## Mission & acquisition strategy

Small Diameter Bomb Increment II (SDB II) is an ACAT 1C joint Department of the Air Force (USAF) and Department of the Navy (DON) program, with the USAF as the lead service. The SDB II increases joint lethality in contested environments. The SDB II can strike a diverse set of targets inside an adversary's air and missile defense networks to destroy mobile platforms through the weather. With increased loadout, range, and munitions effect the network enabled SDB II enhances close combat lethality in complex terrain and provides a net-centric operations capability. BRU-61C/A is a modification of the USAF BRU-61B/A upgraded for DON and F-35 environmental requirements.

The SDB II acquisition strategy was to conduct a full and open competition to select up to two contractors to compete during a planned 42-month risk reduction phase prior to entering Engineering, Manufacturing and Development (EMD). This competition began April 17, 2006 with the signature of contracts to the competing contractors: 1) Raytheon and 2) the team of Boeing and Lockheed Martin. A Fixed Price Incentive Firm Target type contract for EMD, including Firm Fixed Price procurement options for Lots 1-3 was awarded to Raytheon August 9, 2010. Milestone C was approved 4 June 2015, with Lot 1 (Air Force only) awarded 12 June 2015.

## Related program elements

- [0207327F — SDB Increment II](https://hitchintel.com/programs/0207327F) (Air Force)
- [0605223F — Advanced Trainer Replacement T-7A](https://hitchintel.com/programs/0605223F) (Air Force)
- [1206862SF — Tactically Responsive Space (TacRS)](https://hitchintel.com/programs/1206862SF) (Space Force)
- [0604536N — Advanced Undersea Prototyping](https://hitchintel.com/programs/0604536N) (Navy)

## Source & machine access

- **Source:** FY2027 Department of the Navy RDT&E Budget Justification, Exhibits R-2/R-3, PE 0604329N (PB PB2027); FY2027 NDAA committee marks (as of 2026-07-27).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0604329N")`.

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