 In March , NASA was studying the possibility of flying the first Apollo mission as a joint space rendezvous with the final Project Gemini mission , Gemini 12 in November 1966 . But by May , delays in making Apollo ready for flight just by itself , and the extra time needed to incorporate compatibility with the Gemini , made that impractical . This became moot when slippage in readiness of the AS @-@ 204 spacecraft caused the last @-@ quarter 1966 target date to be missed , and the mission was rescheduled for February 21 , 1967 . 
