As in the AIAA survey, about 5% reported puzzling sightings, but skepticism against the Extraterrestrial Hypothesis (ETH) ran high.
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Incidentally, the base had also headquartered two formal unidentified flying object investigations: Project Sign (1947–1948), which had come to favor the extraterrestrial hypothesis before being replaced with Project Grudge (1949–1951), which had a debunking mandate.
In roughly chronological order, he considered the extraterrestrial hypothesis; a secret weapon/aircraft hypothesis, psychic/supernatural/interdimensional hypotheses in the vein of John Keel or Jacques Vallee; deep skepticism; and agnosticism.
It is often contrasted with the better known extraterrestrial hypothesis (ETH), and is particularly popular among UFO researchers in the United Kingdom, such as David Clarke, Hilary Evans, the editors of Magonia magazine, and many of the contributors to Fortean Times magazine.