819px-Project_Mercury_Astronauts_-_GPN-2000-000651 Published on December 8, 2016 in John Herschel Glenn, Jr., Astronaut (18 July 1921–8 December 2016)Full resolution (819 × 1024) ← Previous Next → The Mercury 7. Front row, left to right, Walter H. Schirra, Donald K. Slayton, John H. Glen, Jr., and Scott Carpenter. Back row: Alan B. Shepard, Jr., Virgil I. Grissom, and L. Gordon Cooper. (NASA)