The Saturn V was a multistage liquid-fuel expendable rocket used by NASA's Apollo and Skylab programs and a massive representation of the power generated when Boeing, McDonnell, Douglas and North American coordinated their efforts. Boeing built the Saturn V's first stage, North American the second stage, and McDonnell Douglas, the third. The largest production model of the Saturn family of rockets, the Saturn V was designed under the direction of Wernher von Braun at the Marshall Space Flight Center in Huntsville, Alabama. By 2007, it was still the most powerful launch vehicle ever flown. The Saturn V had 13 missions: the first 12 for the Apollo program and the 13th placed the McDonnell Douglas Skylab into orbit.