Who was the first American in space?
Alan Shepard
Rear Admiral Alan Bartlett Shepard Jr. (November 18, 1923 – July 21, 1998) was an American astronaut, naval aviator, test pilot, and businessman. In 1961 he became the first American to travel into space, and in 1971 he walked on the Moon.
Duane Graveline
Duane Edgar Graveline (March 2, 1931 – September 5, 2016) was an American physician and NASA astronaut. He was one of the six scientists selected in 1965, in NASA's fourth group of astronauts, for the Apollo program. He was best known for being immersed in water for seven days as part of his zero gravity deconditioning research while working as a United States Air Force (USAF) research scientist.