No idea specifically with PFAS, but in general, military installations are used for military training, which has many of the same pollution properties of an act

No idea specifically with PFAS, but in general, military installations are used for military training, which has many of the same pollution properties of an actual war. Spent rounds, links, casings for missiles, rockets, tank rounds, exploded C4, spilled fuel and lubricants. A great deal of effort goes into cleaning up after exercises, but you're never going to get it all. This is at least part of the reason training areas tend to be fairly isolated and remote and ideally nowhere near the water source for a human population. But also why the military has a pretty consistent history of settlement awards for raising cancer rates in at least the families of the personnel themselves who have no choice but to live there.