In September 1962, NASA planned to make four crewed low-Earth-orbital test flights of partially equipped Block I Command/Service Modules (CSM) using the Saturn I launch vehicle, designated SA-11 through SA-14, in 1965 and 1966. However, the limited payload capacity of the Saturn I compared to the uprated Saturn IB would have severely limited the systems carried, and thus the testing value of these flights. Therefore, NASA canceled these flights in October 1963, and replaced them with two crewed Saturn IB missions, designated AS-204 and AS-205. These would be followed by the first uncrewed flight of the Lunar Module (LM) on AS-206, then the third crewed mission, designated AS-207/208, would use AS-207 to launch the crew in an improved Block II CSM, which would rendezvous and dock with the LM launched uncrewed on AS-208.