What program was Wernher von Braun credited with inventing and did Helmut Gröttrup help in managing? 
V-2 rocket program
Title: Wernher von Braun
Passage: 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.  He was the leading figure in the development of rocket technology in Germany and the father of rocket technology and space science in the United States.
Title: Helmut Gröttrup
Passage: Helmut Gröttrup (12 February 1916 – 5 July 1981) was a German engineer and rocket scientist.  He was a manager for Wernher von Braun in the V-2 rocket program.  During 1940, he was program manager for remote guidance and control at Peenemünde Army Research Center.  In December 1940, he was made department head at Peenemünde Army Research Center under Ernst Steinhoff.
Title: Institute Rabe
Passage: Institute RABE (Missile Construction and Development in Bleichenrode) was a Soviet missile research group created to recreate the A-4 flight control system with the help of German rocket specialists.  It was created in July 1945 and originally consisted of 12 Germans under Major Boris Chertok and Lieutenant Colonel Aleksey Mikhaylovich Isayev.  The Institute RABE was also created with the purpose of recruiting German rocket specialists to aid in current and future Soviet rocket development.  This mission had to be kept secret, as the border with American-controlled territory was only 6 km away from the institute.  By the end of August, the institute had settled into their headquarters (the former mansion of Wernher von Braun).  Late in the fall of 1945 the institute successfully completed their most important covert operation when they retrieved Helmut Gröttrup (the deputy for the electrical system and missile control) from American territory along with his family.  In February 1946 the Institute RABE was absorbed into the larger Institute Nordhausen, which had the goal of recreating the entire German A-4 rocket.
Helmut Gröttrup Wernher von Braun