The Saturn IB was a launch vehicle used by NASA during the 1960s and early 1970s. It was designed to support the Apollo program, specifically for missions that did not require the full power of the larger Saturn V rocket. The Saturn IB was capable of carrying crewed spacecraft, such as the Apollo Command and Service Module, into low Earth orbit. This rocket featured a two-stage design, with the first stage powered by eight H-1 engines. The Saturn IB successfully launched several important missions, including the Apollo 7 mission in 1968, which was the first crewed flight of the Apollo program.