This image illustrates the basic differences between the three Saturn launch vehicles developed by the Marshall Space Flight Center. The Saturn I, consisted of two stages, the S-I (eight H-1 engines) and the S-IV (six RL-10 engines). The Saturn IB (center) also consisted of two stages, the S-IB (eight H-1 engines) and the S-IVB (one J-2 engine). The Saturn V consisted of three stages, the S-IC (five F-1 engines), the S-II (five J-2 engines), and the S-IVB (one J-2 engine).

Workers at the Marshall Space Flight Center (MSFC) move a facility test version of the Saturn IB launch vehicle's second stage, the S-IVB, to the J-2 test stand on February 10, 1965. Also known as a "battleship" because of its heavy, rugged construction, the non-flight, stainless-steel model was used to check out testing facilities at MSFC.