I seem to remember that back in the good old days (BITGOD) the cruise missile programmers at McDonnell Douglas were required to punch a Mylar version of a paper tape that was the guidance load for each missile and then it was stored in a vault. I guess that you could decode the holes in the tape to "prove" that the guidance load was correct. Somewhere I have a tape fragment, not from a missile but from some game code. I think this tape was not fan folded but rolled for storage. Mike