John Leonard `` Jack '' Swigert , Jr. ( August 30 , 1931 -- December 27 , 1982 ) was an American test pilot , mechanical and aerospace engineer , United States Air Force pilot , and NASA astronaut , one of the 24 people who have flown to the Moon .
John Leonard `` Jack '' Swigert , Jr. ( August 30 , 1931 -- December 27 , 1982 ) was an American test pilot , mechanical engineer , aerospace engineer , United States Air Force pilot , and NASA astronaut , one of the 24 persons who have flown to the Moon .