Linky to gizmodo please? I had thought it was the mid-1990s due to server changes.
I don’t think this article says how far back the people were effected but I was one who had a top secret clearance. I remember getting the notification from OPM stating that all of the information on all SF 86’s dating back to the mid 80’s had been compromised. This will include everyone in the intelligence field. The year 1985 stands out in my mind. Of course, OPM offered credit protection from a company I’ve never heard of and no nothing about. This a link to the article.
https://gizmodo.com/fbi-arrest-chinese-national-linked-to-opm-data-breach-m-1798411342