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In page Edward J. Ruppelt:

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In 1956, Donald Keyhoe asked Ruppelt to join to serve as an adviser to the National Investigations Committee On Aerial Phenomena (NICAP) . Ruppelt had recently suffered a heart attack, and declined Keyhoe's offer. Ruppelt's book indicates that Ruppelt held some dim views of Keyhoe and his early writings; Ruppelt stated that while Keyhoe generally had his facts straight, his interpretation of the facts was another question entirely. He thought Keyhoe often sensationalized the material and accused Keyhoe of "mind reading" what he and other officers were thinking.