TOP SECRET UMBRA is a classification designation used for highly sensitive signals intelligence (SIGINT). Many of the 300+ nsa UFO intelligence reports released to the disclosure-foundation via FOIA in May 2026 carried this classification.
hunt-willis (Disclosure Foundation chief legal officer) argued that pre-Civil-Rights-Act-era documents should not retain this classification, and pledged legal challenges to remaining NSA UMBRA redactions on UAP material dating to the 1960s.