UNCLASSIFIED - NO CUI
Currently supported Big Bang Version is 2.40.0
https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost/-/blob/7.5.1-bb.4/CHANGELOG.md
https://repo1.dso.mil/platform-one/big-bang/apps/collaboration-tools/mattermost/-/merge_requests/111