Unexplained Aircraft When World War II ended, the Germans had several radical types of new aircraft and guided missiles under development. The majority of these projects were in the most preliminary stages, but they were the only known craft that could even approach the performance of the objects reported by UFO observers. - Edward J. Ruppelt (Head of the U.S. Air Force’s Project Blue Book, 1951-1953) It was alleged by certain German scientists and aviation experts such as Walter Miethe, Klau...