# Project 674920 — Mk21A Reentry Vehicle

**Program element:** 0101328F — ICBM Reentry Vehicles  
**Project:** 674920  
**Component:** U.S. Air Force  
**Appropriation:** 3600 — RDT&E, Air Force  
**Budget Activity:** 7 — Operational System Development  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0101328F/674920  
**Parent:** https://hitchintel.com/programs/0101328F

## Summary

Project 674920 — Mk21A Reentry Vehicle requests $539.8M in FY2027, 74% of the $733.2M requested for program element 0101328F, up 161% on FY2026. 1 R-2A activity decomposes the request. Lockheed Martin is the largest named R-3 performer at $323.5M, 60% of the project's FY2027 R-3 total.

## Funding profile

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 362.9 |
| FY2026 | Enacted | 206.9 |
| FY2027 | Request | 539.8 |
| FY2028 | Outyear | 511.4 |
| FY2029 | Outyear | 416.8 |
| FY2030 | Outyear | 409.8 |
| FY2031 | Outyear | 460.1 |

> Estimate types are not summed. This project is one leaf of PE 0101328F; the PE total is the sum of its projects, never added to them.

## What project 674920 buys

The Mk21A Reentry Vehicle (RV) program will design, develop, produce, and deploy an integrated RV capable of delivering the W87-1 warhead when released from the LGM-35A Sentinel weapon system. The Mk21A program will provide needed performance and security enhancements over the Mk21 RV to meet the upgraded requirements for the Department of Energy (DOE)/ National Nuclear Security Administration (NNSA) W87-1 warhead, while ensuring the time certain delivery of both the W87-1 and Mk21A programs. The Mk21A will also meet the requirements laid out in the LGM-35A Sentinel weapon system Capability Development Document (CDD) as directed by Air Force Global Strike Command. The Mk21A RV includes: shape-stable nose tip; high-impulse transducer; arming and fuzing subsystem (AFS); aeroshell forward section, body section, and rear cover; radio frequency subsystem with antennas; RV spin subsystem; in-flight disconnect cable; and other electrical cables. During the Engineering and Manufacturing Development (EMD) phase, the Mk21A program will include prime contractor development of a critical RV design, applicable support equipment, data, flight test hardware, infrastructure, and training materials while examining and mitigating weapon system integration risks, nuclear surety, hardness and certification, and system vulnerability assessments. Additionally, the program, in conjunction with the DOE/NNSA, will develop test assets to ensure the integration and qualification of the Mk21A and W87-1 on the LGM-35A Sentinel weapon system. This program element may include necessary civilian pay expenses required to manage, execute, and deliver weapon system capability. The use of such program funds would be in addition to the civilian pay expenses budgeted in program elements 0605827F, 0605828F, 0605829F, 0605831F, 0605832F, 0605833F, 0605898F, and 0606398F.

**R-3 lines of work:** Product Development; Support; Test and Evaluation; Management Services.

## Named R-3 performers

| Performer | $M | Share of this project's FY2027 R-3 total |
|---|---|---|
| Lockheed Martin | 323.5 | 60% |
| Northrop Grumman | 101.0 | 19% |
| DOE/NNSA | 34.8 | 6.5% |
| BAE | 8.6 | 1.6% |

> Budget-justification contract funding, not obligations. Shares need not reach 100% — unnamed and government work is in the denominator.

## Activities (R-2A) — 1

| Activity | FY2025 | FY2026 | FY2027 | Move | Page |
|---|---|---|---|---|---|
| Mk21A Engineering & Manufacturing Development (EMD) | 362.9 | 206.9 | 539.8 | +161% | [a0](https://hitchintel.com/programs/0101328F/674920/a0) |

> Activities carry the prior, current and budget year only — no five-year plan. In the request year they partition this project exactly; in earlier years they can under-cover it.

### Mk21A Engineering & Manufacturing Development (EMD)

• Continue to execute EMD contract to continue advancing Mk21A major activities to include systems engineering activities, information technology, data management, analytical capabilities and delivery of mature, low risk reentry vehicle design. • Continue to develop the critical design review for RV hardware. • Increase efforts to…

Full year-by-year narrative: https://hitchintel.com/programs/0101328F/674920/a0

## What is NOT on this page

Congressional marks, the R-2 mission description and acquisition strategy, the industry vs government split of the whole request, and related program elements are recorded at **program-element** grain — an NDAA mark lands on a PE, never on a project. They are at https://hitchintel.com/programs/0101328F.

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibits R-2/R-2A/R-3, PE 0101328F project 674920 (PB PB2027).
- **MCP:** `mcp.hitchintel.com` — `budget_get_program_element(pe="0101328F")`.

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