s="img-fluid figure-img" alt="From the late 1960s to 2010, two former military bases and an air guard station in the Horsham-Warminster-Warrington area used PFAS-containing foam, aqueous film forming foam (AFFF): Willow Grove Former Naval Air Station Joint Reserve Base (NASJRB), Horsham Air Guard Station (HAGS) and Former Naval Air Warfare Center (NAWC). At these sites, AFFF with PFAS was used for a number of events, including firefighter training activities, fire suppression for aircraft crashes, and spill