Printed from https://fiscalreceipts.com/program/MK21A0/ — built September 26, 2026. Every figure is citation-backed; see the page online for per-number provenance.
Mk21A Reentry Vehicle
Budget figures
No FY2026 R-1/P-1 request line for this program element. The FY2026 President's Budget request workbook carries no FY2026 line for it; its last workbook figure is FY2025. The PB2026 J-book detail below does carry an FY2026 row for this line, recorded as zero. A workbook blank and a documented zero are different records, and this page shows both. An absent line is not by itself an ending — PB2026 renumbered program elements at scale across the services and defense agencies, so this work may continue under a different number. No successor is linked for this line: this site's program-lineage layer holds no keyed edge pointing forward from here. That is an absence in this site's lineage layer, not a finding about the program: if the J-book narrative on this page describes a realignment, it is quoted below in the document's own words, and this note does not restate it.
FY2026 award data is a partial year — USAspending reports awards on a rolling basis, and this corpus runs through 2026-09-04. why partial FY2026 data? →
Budget trajectory
| Fiscal year | Amount |
|---|---|
| FY24 | $0J-book detail · PB2026 |
| FY25 | $26.2MP-1 TOA · PB2026 |
| FY26 | $0J-book detail · PB2026 |
Decade view
P-1/R-1 workbook TOA basis, shown compact in $B/$M (the workbook records USD thousands); each figure cites its own President's Budget edition
● actuals (line) · ○ enacted · ◇ request — gaps are editions the program is absent from, never interpolated.
| Series | FY25 |
|---|---|
| Enacted | $26.2M |
| Request | $26.2M |
blank = series not published for this year; – = absent from that edition.
Program lineage
No predecessor/successor lineage was recorded for this program element — no FY-to-FY transfer into or out of this line was stated in the ingested J-books, and none was inferred from the program structure.
Description
Description — Mk21A Reentry Vehicle
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/National Nuclear Security Administration 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. Heatshield Life of Type Buy (LOTB): In FY 2025, the Air Force executed a LOTB to procure and process the heatshield materials to reduce supplier risks in the industrial base. IAW 10 USC 4252, this program has not yet fully satisfied the certification requirement that the heatshield technology has been demonstrated in a relevant environment as required prior to Milestone B approval. The Mk21A uses similar materials and process as currently fielded and the program performed a successful flight test in 3QFY24. The program provided a Technology Readiness Level (TRL) update to SAF/AQR in April 2025 after analysis of flight test data was completed; final decision anticipated 3QFY25. Funding for this exhibit contained in PE 0101328F. Funding may be used to address Diminishing Manufacturing Sources (DMS) issues.
Justification
Justification — Mk21A Reentry Vehicle
No FY2026 funding requested
Budget line items(workbook-cited)
P-1/R-1 workbook Total Obligation Authority basis (USD thousands) · PB2026.
Exhibit P-1
| Account | Org | Type | Amount |
|---|---|---|---|
| Missile Procurement, Air Force | F | FY25 Enacted | $26.2M |
Budget Details(R-2/P-40 facts)
J-book detail basis (R-2/P-40, USD millions) · PB2026 — a different accounting basis from the P-1/R-1 workbook TOA above; where the two disagree, the reconciliation strip under Budget figures shows both.
Wider than this screen — swipe the table sideways for the remaining fiscal-year columns.
| Project | FY24 Actuals | FY25 Total | FY26 Base | FY26 Request |
|---|---|---|---|---|
| Program Element | $0 | $26.2M | $0 | $0 |
Follow the dollar
No follow-the-dollar view — this program's awards haven't been crosswalked at high confidence (flows cover 312 of 1,938 programs). why coverage is partial? →
Awards
No awards are linked to this program element at high or medium confidence — the budget→award crosswalk only asserts links it can defend, and this line has none yet.
Lobbying mentions
No Senate LDA lobbying filing in the tracked data mentions this program element by code or alias.
Oversight
Department-level designation (not specific to this program)
GAO lists 5 high-risk areas for DOD as a whole. That designation covers the department, not Mk21A Reentry Vehicle. No program-specific GAO finding for this line is in the ingested data. See the DOD oversight record.
Program dossier
No research dossier for this program — dossiers cover 50 of 1,938 programs, the largest fully J-book-detailed lines by FY2026 requested dollars. why no dossier here? →
Primary sources
Open any budget figure for its exact receipt. Verified line items lead with the highlighted government PDF; original spreadsheets download with their budget edition and exhibit in the filename.
Budget totals · TOA sources
FY2026 Department of Defense Budget: Procurement Programs (P-1) · comptroller.war.gov
Exhibit P-1 · Q939
Complete workbook · unchanged saved copy. Saves as PB2026_DoD_P-1_Procurement.xlsx.
FY2025 Department of Defense Budget: Procurement Programs (P-1) · comptroller.war.gov
Exhibit P-1 · S959
Complete workbook · unchanged saved copy. Saves as PB2025_DoD_P-1_Procurement.xlsx.
Detailed budget justification
The related TOA spreadsheets above use a different accounting basis from R-2/P-40 detail. Their amounts are not assumed to match these detailed sources.
FY2026 Air Force Missile Procurement · www.saffm.hq.af.mil
PDF page 51