General Hoyt S. Vandenberg
Before the sighting
Decorated WWII USAAF tactical air commander; 2nd Director of Central Intelligence before becoming CSAF.
During the sighting
Summer 1948: ATIC's Project SIGN produced TOP SECRET 'Estimate of the Situation' concluding UFOs were most likely interplanetary spacecraft. Vandenberg as CSAF rejected it on grounds the case wasn't proven (lack of physical evidence), 'batted it back down' the chain. Document was declassified and ordered destroyed. This action institutionally turned USAF away from ET-leaning conclusion at highest level; defined the public-facing USAF UFO position for decades and shaped Grudge/Blue Book successors.
After the sighting
Retired June 30 1953; died nine months later at Walter Reed of prostate cancer age 55. Vandenberg Space Force Base named for him.
Research notes
Career and CSAF tenure exhaustively documented. Biographical record settled. Credibility score reflects how well-documented the man and his role are — NOT whether the Estimate document itself can be produced (it cannot). Fact of rejection is well-supported by Ruppelt (institutionally credible witness); exact wording of Estimate is Ruppelt-attributed only.