SATURN S-IVB is built by DOUGLAS
A key factor in the NASA Apollo program, the Saturn S-IVB, operating as the second and final stage of the Saturn IB, will place the Apollo spacecraft into earth orbit. It will also operate as the third and final stage of the Saturn V, which NASA (National Aeronautics and Space Administration) has assigned to sending a manned Apollo to the moon late in this decade. S-IVB is 58 feet tall and 22 feet in diameter.