What program was Wernher von Braun credited with inventing and did Helmut Gröttrup help in managing? 
Wernher von Braun: Wernher Magnus Maximilian Freiherr von Braun (March 23, 1912 – June 16, 1977) was a German, later American, aerospace engineer and space architect credited with inventing the V-2 rocket for Nazi Germany and the Saturn V for the United States.
i don't know