Captain Edward J. Ruppelt

Air Force Officer

Although he directed Project Blue Book several years later, Ruppelt documented Project Sign extensively and described the reported 'Estimate of the Situation' in his book 'The Report on Unidentified Flying Objects.'

Photo: Captain Edward Ruppelt, standing, and General John Samford, seated to the right of him, discussing the reports of unidentified flying objects with other Air Force officers at a 1952 news conference.
Source: Bettmann Archive/Getty Images