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Ken Mattingly was replaced as the command module pilot for Apollo 13 because he was exposed to German measles and had no immunity to it. To ensure the safety of the crew, Mattingly was replaced by Jack Swigert.
Because Ken Mattingly, who graduated from Auburn, was on the Apollo team.
He had the Measles.
Ken Mattingly was removed from the Apollo 13 mission due to concerns about him possibly being exposed to German measles. Mattingly had not contracted the illness as a child and had not built up immunity, so there was a risk he could become sick during the mission. NASA did not want to risk compromising the safety of the crew during the mission.
The actor that portrayed Ken Mattingly in the movie "Apollo 13" is Gary Sinise.
Ken Mattingly
The astronaut who did not fly on Apollo 13 was Ken Mattingly. He was originally part of the Apollo 13 crew but was replaced by Jack Swigert after being exposed to German measles.
Well, The crew that was supposed to go on Apollo 13 was Alan Sheppard's crew, but he got an ongoing ear infection so he and his crew got bumped. Afterwards, Jim Lovell and his crew (Fred Haise, and Ken Mattingly) were assigned for the Apollo 13 mission, but because the doctors thought Ken Mattingly was going to have the measles, he got bumped from the mission and was replaced with Jack Swigert. Hope this helps! :)
The backup crew for Apollo 11 was James Lovell (CDR), Fred Haise (LMP) and Ken Mattingly (CMP). They later became the prime crew for Apollo 13, though Mattingly was removed from the Apollo 13 crew a few days before launch due to exposure to measles. Jack Swigert, Apollo 13 backup CMP, replaced him. Mattingly later filled what would likely have been Swigert's originally-planned seat on Apollo 16.
he is not qualified
The original Apollo 13 team chosen by N.a.s.A were James Lovell, Fred Haise and Ken Mattingly, but ken Mattingly caught measles. So Mattingly was grounded and back up astronaut Jack Swigert took his place.
The original three crew members of Apollo 13 were James Lovell, Fred .w.Haise and Thomas K. Mattingly. But Mattingly was grounded as he got measles . Jack Swigert replaced him.