Resilient Missile Warning Missile Tracking - Low Earth Orbit (LEO)

Air ForceRDT&EPartial Reconciliation1206446SF

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What it is

Resilient Missile Warning / Missile Tracking - Low Earth Orbit (program element 1206446SF) is a U.S. Space Force research-and-development program funded in the Research, Development, Test, and Evaluation, Space Force account.

What changed

+$882.5M FY25→26 R-1 TOA · PB2026

Who gets it

No award linkage at high confidence.

Budget Figures

FY24 Actuals

$1.48BR-1 TOA · PB2026

FY25 Total

$1.70BR-1 TOA · PB2026

FY26 Request

$2.58BR-1 TOA · PB2026

31.9% reconciliation

$1.76B discretionary + $823.0M one-time reconciliation. Discretionary change vs FY2025 enacted: +3.5%.

FY25→26 Change

+$882.5MR-1 TOA · PB2026

Two official figures, one label— reconciled below

Fiscal Receipts uses P-1/R-1 workbook total obligation authority (TOA) as the headline figure sitewide. The workbook TOA includes budget rows (such as advance procurement) that the R-2/P-40 J-book program line excludes. How the two bases relate →

FY26 Request · $2.58B TOA − $1.76B J-book line = 823.0M (2,580.4 − 1,757.4 = 823.0)

Figures in the sentence are rounded for reading; the parenthesised arithmetic is the same subtraction in USD millions, at the precision where it closes.

FY2026 award data is a partial year — USASpending awards are reported on a rolling basis and the fiscal year does not close until September 30. why partial FY2026 data? →

Budget Trajectory

The program's 3 summary figures for FY24 to FY26, plotted in fiscal-year order so the direction of travel is readable at a glance: this line ends higher than it starts. The points are the summary cards above, not a separate derivation; the table beside the chart carries each figure with its own citation.

Budget trajectory: one row per fiscal year, carrying the summary figure the sparkline plots. Every figure opens its own citation.
Fiscal year	Amount
FY24	$1.48B
FY25	$1.70B
FY26	$2.58B

All series figures: R-1 TOA · 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

6 fiscal years of this program as published (FY2021–FY2026): a line through the actuals (filled dots), with the enacted (hollow circles) and request (diamonds) markers each edition reported. Read it for direction, not for precision — this program's actuals line rises across the span. The grid below is the same data as text, one cited figure per cell.

The vertical scale does not start at zero: the baseline sits just below this program’s smallest year, so a low point on this line is not a small amount. Read the shape for direction and the grid below for the figures.

● actuals (line) · ○ enacted · ◇ request — gaps are editions the program is absent from, never interpolated.

Decade series values by fiscal year and President's Budget edition: one row per series (actuals, enacted, request), one column per fiscal year. Every figure opens its own citation.
Series	FY21	FY22	FY23	FY24	FY25	FY26
Actuals	$0	$0	$786.3M	$1.48B
Enacted	–	$0	$786.3M	$1.27B	$1.70B
Request	–	–	$499.8M	$1.27B	$1.73B	$2.58B

blank = series not published for this year; – = absent from that edition.

Asked vs spent: the PB2023 book requested $499.8M for FY2023; the PB2025 book reported $786.3M as actual total obligation authority — $286.5M above the request. 786.3 − 499.8 = 286.5 USD millions — the compact figures above are rounded for reading.

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

Mission — Resilient MW/MT - LEO

The Space Development Agency (SDA) is developing and demonstrating next generation space capabilities for the joint warfighter enabled by proliferation of satellites in Low Earth Orbit (LEO) and a new acquisition model utilizing rapid spiral development. SDA is developing capabilities to address a wide range of Department of Defense (DoD) space needs as stated in the National Defense Strategy and DoD Space Vision, including advanced missile tracking and global surveillance enabling beyond-line-of-sight targeting. SDA will orchestrate the rapid development and fielding of the Proliferated Warfighter Space Architecture (PWSA), a resilient military sensing and data transport capability via a proliferated space architecture in LEO. This program element funds the development and demonstration of space technologies to deliver Missile Warning, Missile Tracking and Missile Defense (MW/MT/MD) and Fire Control capabilities to U.S. joint warfighting forces in bi-annual tranches, which began in FY 2022. This program element may include necessary civilian pay expenses and contractor support required to support delivery of the MW/MT/MD capability. The FY 2026 cost of the Tranche 1 (T1) Tracking Layer Middle Tier of Acquisition effort is reflected in the budget request, including RDT&E and procurement of prototype units. The Department will certify Future Years Defense Program funding in a future budget submission. The FY 2026 cost of the Tranche 2 (T2) Tracking Layer Middle Tier of Acquisition effort is reflected in the budget request, including RDT&E and procurement of prototype units. The Department will certify Future Years Defense Program funding in a future budget submission. The FY 2026 cost of the Tranche 3 (T3) Tracking Layer Middle Tier of Acquisition effort is reflected in the budget request, including RDT&E and procurement of prototype units. The Department will certify Future Years Defense Program funding in a future budget submission. This program is in Budget Activity 5, System Development and Demonstration (SDD) because it has passed Milestone B approval and is conducting engineering and manufacturing development tasks aimed at meeting validated requirements prior to full rate production.

Justification

Accomplishments & Planned Programs (1)

Resilient Missile Warning Missile Tracking - Low Earth Orbit (LEO)

Rapidly develop, deploy and demonstrate prototype architecture that enables resilient Missile Warning/Missile Tracking/Missile Defense (MW/MT/MD) enabled by a proliferated Low Earth Orbit (pLEO) architecture. This effort will define, demonstrate, and deliver the architectures and standards necessary to fully populate a MW/MT/MD LEO layer as part of the Proliferated Warfighter Space Architecture (PWSA).

Budget Line Items(workbook-cited)

P-1/R-1 workbook Total Obligation Authority basis (USD thousands) · PB2026.

Exhibit R-1

Account	Org	Type	Amount
Research, Development, Test, and Evaluation, Space Force	F	FY24 Actuals	$1.48B
Research, Development, Test, and Evaluation, Space Force	F	FY25 Enacted	$1.70B
Research, Development, Test, and Evaluation, Space Force	F	FY25 Total	$1.70B
Research, Development, Test, and Evaluation, Space Force	F	FY26 Disc. Request	$1.76B
Research, Development, Test, and Evaluation, Space Force	F	FY26 Reconciliation	$823.0M
Research, Development, Test, and Evaluation, Space Force	F	FY26 Total	$2.58B

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	All Prior Years	FY24 Actuals	FY25 Total	FY26 Base	FY26 Request
Program Element	$0	$1.48B	$1.70B	$1.76B	$1.76B
657LEO: Resilient MW/MT - LEO	$0	$1.48B	$1.70B	$1.76B	$1.76B

No follow-the-dollar view — this program's awards haven't been crosswalked at high confidence (flows cover 17 of 1,741 programs). why coverage is partial? →

Awards

No awards are linked to this program element at high confidence — the budget→award crosswalk only asserts links it can defend, and this line has none yet.

Lobbying Mentions

22 mentions from the Senate LDA disclosure database.

AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA INCMissile|Orbit2026matched 2+ title words

Foreign military sales; export controls; AUKUS (Australia United Kingdom United States) legislation; technology…

Resilient Missile Warning Missile Tracking - Low Earth Orbit (LEO)

Budget Figures

Program Lineage

Description

Mission — Resilient MW/MT - LEO source

Justification

Accomplishments & Planned Programs (1)

Budget Line Items(workbook-cited)

Exhibit R-1

Budget Details(R-2/P-40 facts)

Awards

Lobbying Mentions

Oversight

Program dossier

What it is

Why it matters

Key players

Primary Sources

Mission — Resilient MW/MT - LEO