Fred Haise (left), Jack Swigert, and Jim Lovell pose on the day before the launch of Apollo 13. Swigert had just replaced Ken Mattingly as command module pilot after Mattingly was exposed to German measles.
Thomas Kenneth "Ken" Mattingly II, (born March 17, 1936) is a retired American astronaut, Naval Aviator and Rear Admiral in the United States Navy who flew on the Apollo 16, STS-4 and STS-51-C missions. He had been scheduled to fly on Apollo 13, but was held back due to concerns about a potential illness (which he did not contract). He later flew as Command Module Pilot for Apollo 16, making him one of only 24 people to have flown to the Moon.
1970: The original proposed crew of Apollo XIII, Navy Captain James A Lovell Jnr, the Apollo 13 Commander, Thomas Ken Mattingly the Command Module Pilot who was replaced 3 days before lift off by Jack L Swigert Jnr, and Fred W Haise Jnr, the Lunar Module pilot.