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In this task, you are given a set of context paragraph and some supporting facts to answer a question. Your task is to generate answer for given question based on set of context paragraphs and supporting facts.

Context_1 : Von Braun Ferry Rocket was a concept design for a shuttle spacecraft that was developed by Wernher von Braun in a seminal series of early-1950s Collier's magazine articles, Man Will Conquer Space Soon! by Wernher von Braun "et al." The Ferry Rocket concept has evolved over time. Context_2 : 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. Context_3 : Man Will Conquer Space Soon! was the title of a famous series of 1950s magazine articles in "Collier's" detailing Wernher von Braun's plans for manned spaceflight. Edited by Cornelius Ryan, the individual articles were authored by such space notables of the time as Willy Ley, Fred Lawrence Whipple, Dr. Joseph Kaplan, Dr. Heinz Haber, and von Braun. The articles were illustrated with paintings and drawings by Chesley Bonestell, Fred Freeman, and Rolf Klep, some of the finest magazine illustrators of the time. Context_4 : The Von Braun Center for Science & Innovation (VCSI ) is a non-profit research and development organization based in Huntsville, Alabama and is named for pioneering aerospace engineer Wernher von Braun. VCSI is affiliated with NASA, Department of Defense and other federal government agencies. Context_5 : Magnus "Mac" Freiherr von Braun (10 May 1919 21 June 2003) was a German chemical engineer, Luftwaffe aviator, and rocket scientist at Peenemunde, the Mittelwerk, and after emigrating to the United States via Operation Paperclip, at Fort Bliss. He was the brother of Sigismund and Wernher von Braun. Context_6 : Mount Von Braun ( ) is a mountain (3,275m) located 4nautical miles (7km) south of Mount Sabine in the Admiralty Mountains. Mapped by United States Geological Survey (USGS) from surveys and U.S. Navy air photos, 196063. Named by Advisory Committee on Antarctic Names (US-ACAN) for Wernher von Braun of the National Aeronautics and Space Administration, a visitor at McMurdo Station, 196667. Context_7 : Helmut Grottrup (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 Peenemunde Army Research Center. In December 1940, he was made department head at Peenemunde Army Research Center under Ernst Steinhoff. Context_8 : von Braun, named after the rocket pioneer Wernher von Braun, is a lunar crater located near the northwestern limb of the Moon. It lies along the western edge of the Oceanus Procellarum, to the northeast of the crater Lavoisier. The northeastern rim of this crater is on the edge of the Sinus Roris, a bay feature in the northwestern part of the Oceanus Procellarum. Due to its proximity to the limb, this crater appears significantly foreshortened when viewed from the Earth. Context_9 : "Man and the Moon" is an episode of "Disneyland" which originally aired on December 28, 1955. It was directed by Disney animator Ward Kimball. It begins with a humorous look with a man's fascination with the Moon through animation. This segment features characteristics of the Moon depicted from William Shakespeare and children's nursery rhymes to lunar superstitions and scientific research. Then Kimball comes on with some information on the Moon, supplemented by graphics. Kimball then introduces Dr. Wernher Von Braun, who discusses plans for a trip around the Moon. Dr. Wernher Von Braun was employed as a technical consultant on this film by Walt Disney, and on a number of other Disney films. He had a great knowledge of rockets, as he had helped to develop the V-2 rocket while working for Nazi Germany. Context_10 : 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 Grottrup (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. fact_1 : He was a manager for Wernher von Braun in the V-2 rocket program. fact_2 : 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. Question: What program was Wernher von Braun credited with inventing and did Helmut Grottrup help in managing?
Output:
V2 rocket program