The problem with the Apollo 13 , was the commander was alright so there was no need for Alan B. Shepherd to join the crew. mattingly was sick. So Swigert replaced him.
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Alan Shepard was not allowed to command the Apollo 13 mission because he had been grounded from flight duties due to an inner ear disorder. This medical condition made him ineligible to fly in space, let alone command a mission. Jim Lovell was chosen as the commander of Apollo 13 instead.
James Lovell was not assigned as the commander of Apollo 13 because he had already commanded Apollo 8 and NASA wanted to rotate commanders for each mission. NASA decided to assign Alan Shepard, who was scheduled to command Apollo 13, to Apollo 14, and Lovell was selected as the commander of Apollo 13 as a replacement.
The astronauts on Apollo 14 were Alan Shepard, Edgar Mitchell, and Stuart Roosa. Alan Shepard was the mission commander, Edgar Mitchell was the lunar module pilot, and Stuart Roosa was the command module pilot.
The crew members of Apollo 14 were Alan Shepard, Edgar Mitchell, and Stuart Roosa. Alan Shepard was the mission commander, Edgar Mitchell was the lunar module pilot, and Stuart Roosa was the command module pilot.
The Apollo 12 mission in November 1969 included astronauts Charles "Pete" Conrad, Richard F. Gordon Jr., and Alan L. Bean. Pete Conrad and Alan Bean were the ones who walked on the lunar surface during the mission.
Alan L. Bean was the Lunar Module Pilot on Apollo 12. He was born on March 15, 1932. He was the backup command pilot for Gemini 10 and on Apollo 9 he was he backup Lunar Module Pilot. Alan L. Bean was the fourth man to walk on the Moon.