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 .
Hypothesis: John Glenn was a military test pilot.
Label: ENTAILMENT