A new analysis from the nonprofit Environmental Working Group said the Department of Defense is not doing enough to clean up contaminated military installations, and as new sites are identified a large backlog is developing. Many of the sites are contaminated with per- and polyfluoroalkyl substances or PFAS, sometimes called 'forever chemicals' because they don't break down in the environment and accumulate over time. PFAS have been in use since the 1940s and are found in many nonstick and waterproof consumer products. ...