Dieter Grau ( April 24 , 1913 -- December 17 , 2014 ) was a rocket scientist and member of the `` von Braun rocket group '' , at Peenemünde ( 1939 -- 1945 ) working on the V-2 rockets in World War II .
Dieter Grau ( April 24 , 1913 -- December 17 , 2014 ) was a German-American rocket scientist and member of the `` von Braun rocket group '' , at Peenemünde ( 1939 -- 1945 ) working on the V-2 rockets in World War II .