Major Donald Keyhoe
No single individual has done as much as Keyhoe to pierce the veil of
secrecy that imposed by the US military. As a former US Marine fighter
pilot Keyhoe earned the respect of military personnel, especially pilots,
who would often be willing to confide in him rather than the typical
amateur UFO investigator.
Keyhoe established the most objective investigating organisation outside
government circles. It is no accident NICAP was targeted for infiltration
by the intelligence community. Since its demise no successor has emerged
to effectively challenge them. Donald Keyhoe died in 1988.
Books:
Aliens from Outer Space: The Real Story of Unidentified Flying Objects - 1973
Flying Saucers: Top Secret - Putnam - 1960
Flying Saucers From Outer Space - 1953
Strange Effects For UFOs - 1969
The Flying Saucer Conspiracy - Henry Holt - 1955
The Flying Saucers are Real - 1950