I've recently seen documents marked CUI. And yes, I went with the most recent information. However, there are many possible markings, https://www.archives.gov

I've recently seen documents marked CUI. And yes, I went with the most recent information. However, there are many possible markings, https://www.archives.gov/cui/registry/category-marking-list https://www.archives.gov/cui/registry/category-marking-list. You might have seen documents marked 'Controlled' in the past. 800-171 has been required since 2017. Edited to add link to DoD CUI Training https://www.dodcui.mil/Portals/109/Documents/Training%20Docs/21-S-0588%20cleared%20CUI%20Awareness%20Training%20Nov%202020.pdf https://www.dodcui.mil/Portals/109/Documents/Training%20Docs...