transferred to NASA. In a face-to-face meeting with Herb York at the Pentagon, von Braun made it clear he would go to NASA only if development of the Saturn were allowed to continue. Von Braun became the center's first director on 1 July 1960 and held the position until 27 January 1970. Von Braun's early years at NASA included a failed "four-inch flight" during which the first uncrewed Mercury-Redstone rocket only rose a few inches before settling back onto the launch pad. The launch failure was later determined to be the result of a "power plug with one prong shorter than the other because a worker filed it to make it fit". Because of the difference in the length of one prong, the launch system detected the difference in the power disconnection as a "cut-off signal to the engine". The system stopped the launch, and the incident created a "nadir of morale in Project Mercury". 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. The Marshall Center's first major program was the development of Saturn rockets to carry heavy payloads into and beyond Earth orbit. From this, the Apollo program for crewed Moon flights was developed. Von Braun initially pushed for a flight engineering concept that called for an Earth orbit rendezvous technique (the approach he had argued for building his space station), but in 1962, he converted to the lunar orbit rendezvous concept that was subsequently realized. During Apollo, he worked closely with former Peenemünde teammate, Kurt H. Debus, the first director of the Kennedy Space Center. His dream to help mankind set foot on the Moon became a reality on 16 July 1969, when a