ancientaviator2, you raise an excellent point.
All our log books handed down over the generations will become food for cryptographers in the future.
For instance:
Ex Kinsman LL/RBS (UKLL PT12->WF Link)->Leconfield 3RBS
but you would have to know where I was based and what happened next to build the picture.
Perhaps one cold wet day we should go through our log books and decode them for our heirs.