A Faraday cage is not exclusively described by a military specification. It's a physical theory with known physical laws controlling the behavior. Just because the military likes a Faraday cage built a certain way, with specific materials, for particular, imagined scenarios, doesn't mean nothing else is a Faraday cage. Faraday cages existed even before Faraday discovered them. Ben Franklin experimented with them. He didn't understand what he was seeing, but it was the same behavior.
All of that fumbling about predates "mil-std," yet they were still Faraday cages. Go figure.
All of that fumbling about predates "mil-std," yet they were still Faraday cages. Go figure.