アポロ司令・機械船
White's next assignment after Gemini 4 was as the backup for Gemini 7 Command Pilot Frank Borman. He was also named the astronaut specialist for the flight control systems of the Apollo Command/Service Module. By the usual procedure of crew rotation in the Gemini program, White would have been in line for a second flight as the command pilot of Gemini 10 in July 1966, which would have made him the first of his group to fly twice.