Gus Grissom.
Project Gemini and Project Apollo had astronauts practice piloting and working in space.
Project Mercury.
Only seven people were chosen for the Mercury program. Six out of the seven astronauts chosen had a Mercury flight. Deke Slayton was grounded because he had a heart problem (a heart murmur to be exact). He was able to fly as part of the Apollo-Soyuz Test Project. here are the seven mermbers of the Mercury program: Alan Shepard jr. Gus Grissom John Glenn Jr. Scott Carpenter Walter Schirra jr. Gordon Cooper jr. Deke Slayton
As each Apollo spacecraft had three astronauts at a time and seven Apollo crafts flew to the moon, there were a total of 21 astronauts.
Of the seven military test pilots selected as astronauts selected for Project Mercury, only six actually flew Mercury missions: Shepard, Grissom, Glenn, Carpenter, Schirra and Cooper. Slayton was medically grounded in 1962 and replaced by Carpenter, but eventually flew on the last pre-Shuttle mission, the Apollo-Soyuz Tesp Project, in 1975.
Project Mercury. Only seven astronauts were chosen for this. They're called " The original seven " because they were the first astronauts.
One problem with Project Mercury was the spacesuit. It was very heavy and needed to be redesigned several times. Another problem that Project Mercury faced was designing a way to bring back the astronauts without them overheating on re-entry. There were also tragedies to overcome when a test failed and astronauts died.
Project Gimini
The two-man flights of Project Gemini (1965-1966) followed NASA's Mercury program, which launched astronauts in one-man capsules.
Alan Shepard
They were put through a lot of tests and practiced being weightless
Project Mercury sent the first 6 Americans into space. They were all solo flights.
The Mercury program started in 1961. There had been a total of six flight during this project. The last flight was on 1963. Astronauts aimed to go to space to make observations.
The first seven were the first seven American Men in Space flight- not a memorial or posthumous angle. There were No in-flight fatal accidents in the Mercury or Gemini programs, and only one ( killing three Astros= Grissom, White , and Chafee) in a ground test that caught fire-in the Apollo program. There were, to date two ( All hands) fatal accidents in the space shuttle program, involving the shuttles CHALLENGER and COLUMBIA. Mercury program was accident-free.
He was in Project Mercury.
Project Gemini and Project Apollo had astronauts practice piloting and working in space.
Project Mercury was created in 1959.