In my experience, this was one of those fads that didn’t last long… don’t recall hearing it much after 1966, nor before… do recall, however, hearing the term used by a Brigadier General.
One of the standard expectations of those in leadership positions at the platoon and lower levels is that those so privileged is that they will know everything about those Marines in their charge, down to each Marine’s Mother’s maiden name, and her boot size… The CG of the forces involved in operation Hastings was General English, and the operation’s name was most likely chosen because it was to occur on the 900th anniversary of the Battle of Hastings in England… the original having been in 1066 (you can look it up…)