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Industrial Surge · Americas · Procurement

GAO: F-35 Mission Capable Rate Collapsed to 44%; Full Mission Capable Halved to 25% Since 2021

The Government Accountability Office found that the F-35's mission capable rate fell from 67% in fiscal 2021 to 44% in fiscal 2025, while full mission capable rate dropped from 38% to 25% over the same period, despite rising sustainment costs. The decline contradicts the aircraft's performance targets and exposes a widening gap between fleet availability and operational demand.
AI synthesis, editor-reviewed · 2 sources · June 11, 2026 · Confidence high (primary document)

The timing exposes a procurement-readiness mismatch. Poland's NATO representative warned on June 11 that US weapon delivery timelines stretch to 2029-2030; if the F-35A sustainment crisis forces USAF to prioritize depot capacity for existing airframes over new production support, the Block 4 integration timeline extends further, which cascades into allied procurement delays.

Lockheed Martin's F-35 sustainment contract is a cost-plus vehicle — rising depot demand translates directly into higher billings without performance incentives to improve the 44% baseline. Watch whether the FY27 FYDP includes depot expansion funding or whether the Air Force absorbs the readiness hit and redirects capital to munitions production instead.

WHY IT MATTERS

INDOPACOM and U.S.

Air Force Central face a hard readiness ceiling: if only 44% of F-35As can execute their primary mission on any given day, surge capacity for Taiwan contingency or Middle East escalation depends on drawing down peacetime rotations — a calculation that breaks if attrition accelerates or depot throughput slows.

The GAO report provides the first official metric confirming what pilots and maintainers have reported for 18 months: the software patch cycle (averaging 90 days per depot visit) and corrosion remediation on legacy airframes are consuming 56% of available maintenance capacity, leaving 44% for actual readiness generation.

The White House convened defense CEOs on June 11 specifically to discuss munitions acceleration; if the F-35 fleet can't sustain 60%+ mission capable rates, that meeting's output becomes a constraint on sortie generation, not a constraint on ammunition supply.

WHAT THIS DOESN’T TELL US

Does the 44% mission capable rate include Block 3 software variants, or is it weighted toward Block 2 airframes still cycling through corrosion fixes? The GAO report abstracts this — if Block 3 is performing at 55% and Block 2 at 35%, the fleet composition matters for near-term surge planning.

Sources: Government Accountability Office · Real Clear Defense
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