RDT&E Program Element · President's Budget PB2027

Advanced Complex Systems

PE 0603468E·Defense-Wide·Approp. 0400 — RDT&E·BA3 — Advanced Technology Development
FY2027 Request
$540.4M
◆ Scaling +105%
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Defense-Wide funding ramps 105% to a $540.4M request in FY2027, sustained across the five-year plan. In the FY2027 defense authorization, the House funded it in full; the Senate funded it in full; House appropriators added 4.6% (to $565.4M).

FY2027 Request
$540.4M
▲ 105% vs FY2026
FY2026 Enacted
$263.5M
No FY2025 funding
FY2025 Actual
$0.0M
Prior year

Roll-up of 2 projects. Projects are the summable leaves — the PE total is their sum, never added to it.

For fiscal year 2027, Defense-Wide agencies are requesting $540.4M for Advanced Complex Systems under RDT&E program element 0603468E, up 105% over FY2026.

Funding trajectory

Funding profile, FY2025–FY2031

Prior years are actuals, the budget year is the request, and the outyears are the FYDP plan. Estimate types are colored and never summed into one figure.

25050075000.0FY25ACTUAL263.5FY26ENACTED540.4FY27REQUEST787.7FY28848.0FY29845.7FY30840.8FY31
Actual Enacted Request Outyear (FYDP)
Fiscal YearEstimate TypeAmount ($M)
FY2025Actual0.0
FY2026Enacted263.5
FY2027Request540.4
FY2028Outyear787.7
FY2029Outyear848.0
FY2030Outyear845.7
FY2031Outyear840.8
Where it sits

Acquisition lifecycle

This program is funded in RDT&E Budget Activity 3 — Advanced Technology Development.

Complete
Research
BA 1–2
Current
Advanced Technology
BA 3
Later
Prototyping
BA 4
Later
Development & Fielding
BA 5–7
Inside the program element

2 projects roll up into PE 0603468E

Projects are the summable leaves — the PE total is their sum, never added to it. Program elements and projects carry the full five-year plan; activities stop at the budget year. This PE moves 105% overall, which can hide much larger swings below.

Congressional action

Congressional marks

Committee marks on the FY2027 request. Adds and cuts are reconciled in conference before they become law.

RequestPresident's Budget
$540.4M
House NDAA (HASC)HASC
$540.4M full · +$0
Senate NDAA (SASC)SASC
$540.4M full · +$0
House Approps (HAC-D)HAC_D
$565.4M +$25.0M · +4.6%
▲ $25.0M chamber gap — unresolved as of 2026-07-27. These are FY2027 authorization marks (NDAA); appropriations and the conference agreement may differ.
Program detail

Mission & acquisition strategy

The efforts described in this Program Element (PE) address the Advanced Technology Development associated with the Advanced Complex Systems Program that is focused on exploiting high pay-off opportunities to provide revolutionary new system capabilities, as opposed to incremental or evolutionary advancements, in order to achieve undeterrable air and space presence at dramatically reduced costs. Rapid prototyping and experimentation of integrated system concepts, as well as enabling vehicle subsystems will be conducted.

Project ACX-01, ACX-07 — ADVANCED COMPLEX SYSTEMS
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Answers are generated from the figures on this page — the FY2027 justification exhibits and the marks tracked above — and nothing else is consulted. Confirm any figure against the cited exhibit before you use it externally.

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Questions this page can answer
How does the FY2027 request compare with FY2026, and what does the five-year plan show?What did the FY2027 NDAA committees do to this request?Which project inside PE 0603468E is growing fastest, and which is shrinking?In plain terms, what is this program element for and how is it being acquired?

This page carries the budget justification and the NDAA marks — nothing else. For what a contractor has actually been obligated, the ledger is at hitchintel.com/vendors; for live solicitations, hitchintel.com/opportunities. Both are member surfaces.

Provenance

Cite this page

Sources
FY2027 Office of the Secretary of Defense RDT&E Budget Justification · Exhibits R-2 / R-3 · PE 0603468E (President's Budget PB2027) — and FY2027 NDAA committee marks, as tracked 2026-07-27.
Suggested citation
HitchAI, "Advanced Complex Systems (PE 0603468E)," federal budget intelligence, PB2027 vintage. hitchintel.com/programs/0603468E
Machine access
Markdown twin /programs/0603468E.md · MCP mcp.hitchintel.combudget_get_program_element, budget_get_cong_marks
FY2027 Request
$500.1M
▲ 105% vs FY2026
FY2026 Enacted
$243.9M
No FY2025 funding
FY2025 Actual
$0.0M
Prior year

ADVANCED COMPLEX SYSTEMS — one RDT&E project inside PE 0603468E. Congressional marks are recorded on the program element, not on a project.

Project ACX-01 — ADVANCED COMPLEX SYSTEMS — requests $500.1M in FY2027, 93% of the $540.4M requested for program element 0603468E. Year over year it grows 105% against FY2026.

Funding trajectory

Project ACX-01 funding, FY2025–FY2031

Prior years are actuals, the budget year is the request, and the outyears are the FYDP plan. Estimate types are colored and never summed into one figure. Projects carry the full five-year plan; the activities inside them stop at the budget year.

25050075000.0FY25ACTUAL243.9FY26ENACTED500.1FY27REQUEST702.2FY28761.0FY29768.1FY30763.2FY31
Actual Enacted Request Outyear (FYDP)
Fiscal YearEstimate TypeAmount ($M)
FY2025Actual0.0
FY2026Enacted243.9
FY2027Request500.1
FY2028Outyear702.2
FY2029Outyear761.0
FY2030Outyear768.1
FY2031Outyear763.2
Inside the project

14 accomplishments / planned programs

The R-2A exhibit. Activities carry the prior, current and budget year only — no five-year plan — and they are descriptive: coverage is partial and they do not always add back to the project, so count them, never total them. Opening lines only here — the full year-by-year narrative is on the project page.

Valley Forge▲ 706%
FY2025 actual
FY2026 enacted$4.6M
FY2027 request$37.1M

- Conduct propulsion system risk reduction testing. - Conduct avionics system risk reduction testing. - Mature missile designs based on early risk reduction activities. - Develop missile manufacturing plans and cost assessments based on missile designs.

Longshot▲ 188%
FY2025 actual
FY2026 enacted$52.7M
FY2027 request$151.5M

- Continue flight demonstrations validating vehicle release from a host aircraft. - Continue flight demonstrations validating vehicle performance, stability and control through all phases of flight. - Conduct analysis and flight testing to expand flight envelope. - Continue analysis and development of integrated mission systems to mature…

Read the FY2027 plan →
FY2025 actual
FY2026 enacted$47.5M
FY2027 request$62.1M

- Finalize flight test planning and airworthiness certification. - Complete structural proof load test to verify the built aircraft matches structural design predictions. - Complete final software integration lab verification testing to ensure the system operates as intended including the proper vehicle responses in the presence of…

Read the FY2027 plan →
Otter▲ 33%
FY2025 actual
FY2026 enacted$35.8M
FY2027 request$47.7M

- Continue to conduct flight hardware acceptance testing for the propulsion system. - Continue to integrate the developed propulsion systems with the air harvesting inlets. - Continue conducting environmental qualification tests for the air harvesting inlets. - Finalizing ground software build and testing. - Finalizing flight software…

Read the FY2027 plan →
FY2025 actual
FY2026 enacted$51.6M
FY2027 request$32.2M

- Expand operational testing into increasingly complex and contested environments, including electronic warfare scenarios, to rigorously evaluate system robustness and adaptability. - Advance multi-platform collaboration by integrating heterogeneous teams, such as manned-unmanned formations, to assess the scalability of the autonomous…

Read the FY2027 plan →
More Opportunities with HAWC (MoHAWC)flat
FY2025 actual
FY2026 enacted$20.0M
FY2027 request$20.0M

- Execute multiple flight tests. - Complete flight test data analysis and final program review.

Robotic Servicing of Geosynchronous Satellites (RSGS)▼ 76%
FY2025 actual
FY2026 enacted$7.0M
FY2027 request$1.7M

- Conduct on-orbit demonstrations of satellite servicing capabilities.

FY2025 actual
FY2026 enacted
FY2027 request$13.0M

- Execute end-to-end validation testing on novel energetic materials developed from diverse materials. - Conduct a system readiness review based on outcomes from sub-scale demonstrations and validation tests on modular platforms. - Demonstrate pilot scale production capability on modular platforms.

Read the FY2027 plan →
Lunar Assay via Small Satellite Orbiter (LASSO)NEW
FY2025 actual
FY2026 enacted
FY2027 request$8.9M

- Conduct final mission design planning and verification testing of spacecraft subsystems. - Verify spacecraft and integrated sensor performance through full fidelity Software-in-the-Loop (SWIL) simulations.

Rubble to Rockets (R2)NEW
FY2025 actual
FY2026 enacted
FY2027 request$7.5M

- Iterate sounding rocket design trials with more diverse, impure, and complex mixed material inputs. - Conduct a critical design review evaluating the performance of the systems based on demonstrations. - Demonstrate and validate adaptively redesigned pressure vessel formed from government-provided scrap material inputs of increased…

FY2025 actual
FY2026 enacted
FY2027 request$56.0M

- Enhanced Propulsion Efficiency: Analyze new propulsion technologies, such as Rotating Detonation Engines (RDE) among others, that offer the potential for increased fuel efficiency in flight, leading to longer range and reduced operating costs. - Improved Thrust-to-Weight Ratio: Design a higher thrust-to-weight ratio that could enable…

Read the FY2027 plan →
FY2025 actual
FY2026 enacted$0.1M
FY2027 request$62.3M

- Initiate research approaches for technologies that enable decisive military effects at distances from the tactical to the strategic. - Explore new insertion routes and cost/fuel efficient range improvements. - Research technologies for pervasive persistence for observation and constant low-level engagement, supporting blue force and…

Read the FY2027 plan →
DARPA Lift Challenge▼ 100%
FY2025 actual
FY2026 enacted$13.4M
FY2027 request

- Initiate challenge logistic set up following public announcement. - Conduct challenge event including set up, competition, award announcement, and tear down.

Control of Revolutionary Aircraft with Novel Effectors (CRANE)▼ 100%
FY2025 actual
FY2026 enacted$6.3M
FY2027 request

- Complete demonstrator production and subsystem integration. - Complete ground-based testing. - Execute flight test campaign. - Complete flight-testing review and data delivery.

Project ACX-01 — every activity in full →
Project detail

What project ACX-01 buys

The Advanced Complex Systems project is focused on exploiting high pay-off opportunities to provide revolutionary new system capabilities, as opposed to incremental or evolutionary advancements, in order to achieve undeterrable air and space presence at dramatically reduced costs. Rapid prototyping and experimentation of integrated system concepts, as well as enabling vehicle subsystems will be conducted. Programs will explore new architectural concepts that employ a mix of weapon technologies that achieve lethality through a combination of overwhelming performance and overwhelming numbers rather than through the use of singular and costly high value assets. Efforts conducted under this program element include examination and evaluation of emerging aerospace threats, technologies, concepts, use of autonomy to minimize risk, and applications for missiles, munitions, and vehicle systems. Prior to FY 2026, efforts in this Project were funded in PE 0603286E, Project AIR-01, and PE 0603287E, Project SPC-01.

FY2027 Request
$40.3M
▲ 106% vs FY2026
FY2026 Enacted
$19.6M
No FY2025 funding
FY2025 Actual
$0.0M
Prior year

ADVANCED COMPLEX SYSTEMS SUPPORT — one RDT&E project inside PE 0603468E. Congressional marks are recorded on the program element, not on a project.

Project ACX-07 — ADVANCED COMPLEX SYSTEMS SUPPORT — requests $40.3M in FY2027, 7.5% of the $540.4M requested for program element 0603468E. Year over year it grows 106% against FY2026.

Funding trajectory

Project ACX-07 funding, FY2025–FY2031

Prior years are actuals, the budget year is the request, and the outyears are the FYDP plan. Estimate types are colored and never summed into one figure. Projects carry the full five-year plan; the activities inside them stop at the budget year.

25507500.0FY25ACTUAL19.6FY26ENACTED40.3FY27REQUEST85.6FY2887.0FY2977.6FY3077.6FY31
Actual Enacted Request Outyear (FYDP)
Fiscal YearEstimate TypeAmount ($M)
FY2025Actual0.0
FY2026Enacted19.6
FY2027Request40.3
FY2028Outyear85.6
FY2029Outyear87.0
FY2030Outyear77.6
FY2031Outyear77.6
Project detail

What project ACX-07 buys

The Advanced Complex Systems Support project contains management costs in support of DARPA functions and activities across the entire Advanced Complex Systems PE. These costs include: DARPA classified and unclassified network support and equipment; contractor support; classified program security; building security; commercial transition services that increase the likelihood that DARPA-funded technologies remain in the U.S. and provide new capabilities for national defense; DARPA outreach to universities and industry; external contracting, financial and support fees; Program Manager Intragovernmental Personnel Act (IPA) Funding; Program Managers from other Government Agencies; and similar operating expenses. Agency support is allocated on a pro-rata basis across the Agency's BA1, BA2 and BA3 PEs and, therefore, fluctuates per PE by fiscal year based on the total Agency budget in that fiscal year. Prior to FY 2026, support requirements in this Project were funded in PE 0603286E, Project AIR-01, and PE 0603287E, Project SPC-01.