Thomas Kenneth Mattingly II (born March 17, 1936), (RADM, USN, Ret.) is a former American naval officer and aviator, aeronautical engineer, test pilot, Rear Admiral in the United States Navy and astronaut who flew on the Apollo 16, STS-4 and STS-51-C missions.
Mattingly had been scheduled to fly on Apollo 13, but three days prior to launch, he was held back and removed from the mission due to exposure to German measles (which he did not contract).
He later flew as Command Module Pilot for Apollo 16 and made 64 lunar orbits, making him one of 24 people to have flown to the Moon.
Mattingly and his commander from Apollo 16, John Young, are the only people to have flown to the Moon and also a Space Shuttle orbital mission (Fred Haise, his former training crewmate from Apollo 13, did atmospheric flight testing of the Space Shuttle "Approach and Landing Tests").
During Apollo 16's return flight to Earth, Mattingly performed an extravehicular activity to retrieve film cassettes from the exterior of the spacecraft, the command and service module.
It was the second "deep space" EVA in history, at great distance from any planetary body.
As of 2019, it remains one of only three such EVAs which have taken place, all during the Apollo program's J-missions.