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Apollo 503

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Apollo vs N1-L3 Apollo CSM / LM vs L3 Lunar Complex Credit: © Mark Wade

Launched: 1967 December. Number crew: 3 .

The third Apollo flight announced on December 22, 1966, was the Apollo E mission - a test of the Apollo lunar module in high earth orbit. The Borman crew would be launched aboard a Saturn V, and put into a very high earth orbit. In mid-1968 Collins had to leave the crew due to a medical problem, and was replaced by Lovell. By late 1968, Apollo 7 had flown the Apollo C mission, but delays with the lunar module meant that neither the D or E profile missions could be flown. In order to beat the Russians around the moon, it was decided that the E mission would be cancelled and instead Borman's crew would fly an Apollo CSM into lunar orbit. This became Apollo 8.

• Apollo 503 (cancelled) - . Crew: Anders, Borman, Collins. Backup Crew: Conrad, Gordon, Williams, Clifton. Nation: USA. Program: Apollo. Flight: Apollo 503. Spacecraft: Apollo CSM.

  The third Apollo flight announced on December 22, 1966, was the Apollo E mission - a test of the Apollo lunar module in high earth orbit. In order to beat the Russians around the moon, it was decided that the E mission would be cancelled and instead Borman's crew would fly an Apollo CSM into lunar orbit. This became Apollo 8.