AS-203, the third Saturn IB launch vehicle developed by the Marshall Space Flight Center, lifts off from Cape Canaveral, Florida , July 5, 1966. Primary mission objectives included evaluation of the S-IVB stage's hydrogen venting and engine restart capabilities in an orbital environment. In all, nine Saturn IB flights were made, ending with the Apollo-Soyuz Test Project (ASTP) in July 1975.
