Thomas Kenneth "Ken" Mattingly II, (born March 17, 1936) is a retired American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 astronaut

Astronaut

An astronaut or cosmonaut is a person trained by a human spaceflight program to command, pilot, or serve as a crew member of a spacecraft....

 and rear admiral

Rear admiral (United States)

Rear admiral is a naval commissioned officer rank above that of a commodore and captain, and below that of a vice admiral. The uniformed services of the United States are unique in having two grades of rear admirals.- Rear admiral :...

 in the United States Navy

United States Navy

The United States Navy is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States. The U.S. Navy is the largest in the world; its battle fleet tonnage is greater than that of the next 13 largest navies combined. The U.S...

 who flew on the Apollo 16

Apollo 16

Young and Duke served as the backup crew for Apollo 13; Mattingly was slated to be the Apollo 13 command module pilot until being pulled from the mission due to his exposure to rubella through Duke.-Backup crew:...

, STS-4

STS-4

STS-4 was a NASA Space Shuttle mission, using the Space Shuttle Columbia. The mission launched on 27 June 1982 and landed a week later on 4 July. STS-4 was the fourth shuttle mission overall, and was also the fourth mission for the Columbia.-Crew:...

 and STS-51-C

STS-51-C

STS-51-C was the 15th flight of NASA's Space Shuttle program, and the third flight of Space Shuttle Discovery. It was also the first shuttle mission to deploy a dedicated United States Department of Defense payload, and as such many mission details remain classified...

 missions. He had been scheduled to fly on Apollo 13

Apollo 13

Apollo 13 was the seventh manned mission in the American Apollo space program and the third intended to land on the Moon. The craft was launched on April 11, 1970, at 13:13 CST. The landing was aborted after an oxygen tank exploded two days later, crippling the service module upon which the Command...

, 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.
Born in Chicago, Illinois

Chicago

Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

, Mattingly attended school in Hialeah, Florida

Hialeah, Florida

Hialeah is a city in Miami-Dade County, Florida, United States. As of the 2000 census, the city population was 226,419. As of 2009, the population estimate by the U. S...

, and was active in the Boy Scouts of America

Boy Scouts of America

The Boy Scouts of America is one of the largest youth organizations in the United States, with over 4.5 million youth members in its age-related divisions...

 where he achieved its second highest rank, Life Scout.