Aqueous film-forming foam (AFFF) has been the U.S. military’s primary tool for suppressing Class B fuel fires since the 1960s. AFFF formulations rely on PFAS—particularly PFOS and PFOA precursors—to form the thin aqueous film that suppresses fuel vapor and smothers fires at aircraft hangars, fuel depots, and naval vessels. The environmental legacy of decades of AFFF use at military installations has made the Department of Defense (DoD) the single largest known source of PFAS groundwater contamination in the United States, affecting hundreds of communities adjacent to military bases.
FY2020 NDAA Mandate and Transition Timeline
Section 322 of the Fiscal Year 2020 National Defense Authorization Act (NDAA) mandated that DoD cease procurement of PFAS-containing AFFF and transition to fluorine-free foam (F3) alternatives by October 1, 2024, for non-aviation uses. For aviation crash rescue and shipboard use—where AFFF performance standards are most stringent—the deadline was extended pending qualification of F3 alternatives that meet MIL-SPEC performance requirements.
The transition has proceeded unevenly. DoD has qualified several F3 formulations for non-aviation hangar protection and established a stockpile drawdown plan for legacy AFFF inventories. However, aviation-specific applications remain technically challenging: F3 foams must meet stringent ICAO and U.S. military performance standards for flame knockdown time and burnback resistance that current fluorine-free formulations approach but have not yet universally matched in all operational scenarios.
Remediation Liability and Congressional Oversight
The DoD’s PFAS remediation liability is estimated in the tens of billions of dollars. As of 2024, the Pentagon has identified over 700 installations with known or suspected PFAS releases, with hundreds of surrounding communities relying on affected groundwater or surface water supplies. Congress has appropriated over $1 billion annually in recent defense authorization acts for PFAS investigation, cleanup, and affected community water supply support.
DoD’s transition from AFFF is also influencing civilian aviation and industrial fire suppression markets. Airports, petroleum refineries, and chemical plants that use AFFF formulations are watching military qualification processes closely, as F3 foams receiving MIL-SPEC approval are likely to also satisfy ICAO and NFPA standards. Several major airports in Europe have already transitioned to F3 under EU pressure, providing operational data that informs U.S. adoption timelines.
Environmental advocates have criticized the pace of remediation at impacted communities, arguing that DoD prioritizes cleanup at active installations over civilian well contamination. Legislative efforts to establish a dedicated PFAS remediation fund and to accelerate cleanup timelines at sites serving low-income communities have gained traction in Congress, though funding levels remain a point of ongoing negotiation.