This bill proposes to amend Section 8143b(b) of title 5, United States Code, by adding Parkinson's disease to the list of illnesses and diseases presumed to be proximately caused by employment in fire protection activities. Currently, certain conditions are automatically considered work-related for federal firefighters, easing their path to disability and compensation benefits. By including Parkinson's disease, the legislation aims to provide similar support for firefighters who develop this debilitating neurological disorder. This amendment would streamline the process for affected firefighters to claim benefits, recognizing the potential link between their hazardous work environment and the onset of Parkinson's disease, thereby ensuring they receive due compensation without extensive proof of causation.