(Sait Serkan Gurbuz | AP Photo) Rep. Alexandria Ocasio-Cortez, D-N.Y., speaks at a House Oversight and Reform subcommittee hearing on PFAS chemicals and their risks on Wednesday, March 6, 2019, on Capitol Hill in Washington. The Pentagon defends its handling and continued use of a toxic firefighting foam that it acknowledges has contaminated water around more than 400 military bases, as military families and officials from states testify on the health and financial tolls.