# Mk21A Engineering & Manufacturing Development (EMD)

**R-2A activity** of project 674920 — Mk21A Reentry Vehicle  
**Program element:** 0101328F — ICBM Reentry Vehicles  
**Component:** U.S. Air Force · **Budget Activity:** 7  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/programs/0101328F/674920/a0  
**Parent:** https://hitchintel.com/programs/0101328F/674920

## Summary

This activity requests $539.8M in FY2027, 100% of project 674920, up 161% on FY2026. The R-2A exhibit describes it across FY2026–FY2027, including what the FY2027 money is planned to buy.

## What the FY2027 request buys

**FY2027 planned work.** • 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 develop and build test assets supporting the qualification of the Mk21A and W87-1 on the LGM-35A Sentinel weapon system in collaboration with the DOE/NNSA. • Continue LGM-35A Sentinel integration activities to support delivery of the Mk21A and W87-1. • Continue ground testing at DOE/NNSA to collect relevant environmental data to feed W87-1 development. • Increase efforts in flight test planning with the LGM-35A Sentinel weapon system. • Increase efforts to conduct flight test of heatshield test vehicle and W87-1 environmental flight test unit on a RSLP Minotaur or similar launch vehicle. • Continue activities to mitigate RV development risks including prototype RV/heatshield flight test. • Continue maturing MBSE enabling the government to own the technical baseline. • Continue to develop, mature, and execute a unified certification strategy which meets nuclear surety, cyber security, and nuclear safety requirements.

**FY2026 to FY2027 change.** Funding increased due to ramp up of LGM-35A Sentinel integration and test activities.

## Before the request year

**FY2026 plans — current year.** • 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. • Develop the critical design review for RV hardware. • Continue to develop and build test assets supporting the qualification of the Mk21A and W87-1 on the LGM-35A Sentinel weapon system in collaboration with the DOE/NNSA. • Conduct LGM-35A Sentinel integration activities to support delivery of the Mk21A and W87-1. • Conduct ground testing at DOE/NNSA to collect relevant environmental data to feed W87-1 development. • Conduct flight test planning with the LGM-35A Sentinel weapon system. • Conduct flight test of heatshield test vehicle and W87-1 environmental flight test unit on a RSLP Minotaur or similar launch vehicle. • Conduct activities to mitigate RV development risks including prototype RV/heatshield flight test. • Conduct maturing MBSE enabling the government to own the technical baseline. • Develop, mature, and execute a unified certification strategy which meets nuclear surety, cyber security, and nuclear safety requirements.

## Funding

| Fiscal Year | Estimate Type | Amount ($M) |
|---|---|---|
| FY2025 | Actual | 362.9 |
| FY2026 | Enacted | 206.9 |
| FY2027 | Request | 539.8 |

> 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.

## Source & machine access

- **Source:** FY2027 Department of the Air Force RDT&E Budget Justification, Exhibit R-2A, PE 0101328F project 674920 (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.*