After the flight of Mercury-Redstone 2 in January 1961 experienced a string of problems, von Braun insisted on one more test before the Redstone could be deemed man-rated. His overly cautious nature brought about clashes with other people involved in the program, who argued that MR-2's technical issues were simple and had been resolved shortly after the flight. He overruled them, so a test mission involving a Redstone on a boilerplate capsule was flown successfully in March. Von Braun's stubbornness was blamed for the inability of the U.S. to launch a crewed space mission before the Soviet Union, which ended up putting the first man in space the following month. Three weeks later on 5 May, von Braun's team successfully launched Alan Shepard into space. He named his Mercury-Redstone 3 Freedom 7