Skylab was the first space station of the United States. It was launched on May 14, 1973 on an extra Saturn V Moon rocket. It was launched without the third stage, lunar module, or command/service module because Skylab was itself an extra third stage that was turned into a space station, which is called a wet workshop. The Apollo spacecraft visited the station three times. If there was any problem, an Apollo spacecraft with Vance D. Brand and Don L. Lind could rescue the crews.