Premise: John Herschel Glenn Jr. ( July 18 , 1921 -- December 8 , 2016 ) was a United States Marine Corps aviator , engineer , astronaut , and United States Senator from Ohio . He was one of the Mercury Seven , military test pilots selected in 1959 by NASA as the United States ' first astronauts . On February 20 , 1962 , Glenn flew the Friendship 7 mission ; the first American to orbit the Earth , he was the fifth person in space .
Hypothesis: John Glenn is an American astronaut.
Label: ENTAILMENT