I was downloading ETMs from the LOGSA website in 2004. But those were just digital copies with hyperlinked bookmarks. Nothing all that innovative. I was advocating integrating technical references with the supply system networks to streamline technical work.
In regard to doctrinal pubs, I think we should keep a firewall between between doctrinal pubs and training materials. Otherwise, the tendency will be for the authors to create a training device in the form of a doctrinal pub and for people to click through the training material rather than absorb the doctrine.
Bookmarks