You got it basically right but STU-IIIs are no longer in service and were replaced STEs many years ago.
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LOL. Actually I thought of that possibility after my post. I guess I’m dating myself since I am definitely from the STU-III generation. I should have done a little research before the post.
Thanks for the heads-up.
From this article:
“To aid understanding of how security classification works in the real world of the Intelligence Community, I’m giving you a sample intelligence assessment which I will walk you through to illustrate how this plays out every day in Washington, DC.”
http://20committee.com/2015/08/16/hillarys-emailgate-understanding-security-classification/