Apparently my civilian side was overriding. I learned something and I stand corrected.
You did. It occurred to me that an instructor I used to work with was a military rigger in the 80's and 90's, so I asked him about it. The military documents, double documents, and over-documents everything they do. Not only do they keep log books in their lofts of everything they do, including main pack jobs, as I surmised the other day, but indeed military mains do have packing cards.