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A senior airman blows a small sea of fire retardant foam that was unintentionally released in an aircraft hangar at Travis Air Force Base in California on Sept. 24, 2013. Firefighting foams such as these are now known to contain PFAS, which don't break do (U.S. Air Force photo/Ken Wright/Released) A senior airman blows a small sea of fire retardant foam that was unintentionally released in an aircraft hangar at Travis Air Force Base in California on Sept. 24, 2013. Firefighting foams such as these are now known to contain PFAS, which don't break down in the environment or body.