Mercury is the first program of the manned space flights in USA. The program Mercury was carried out from 1961 through 1963. Under the program Mercury six manned space flights were conducted.
Alan Shepard has made the first American space flight by the space ship Freedom-7. Almost in one month after orbital flight of Gagarin, Shepard has executed suborbital flight by duration 15 minutes.
Virgil Grissom has made the second space flight under the program Mercury. This flight was suborbital too. This flight was executed by the space ship Liberty Bell-7.
John Glenn has made the first american orbital flight (3 cirquit) on the board of Friendship-7. Another three flights under the program Mercury were executed: Malcolm Carpenter on the space ship Aurora-7, Walter Schirra on the space ship Sigma-7 and Gordon Cooper on the space ship Faith-7.
All names of the space ships under the program Mercury terminated in figure 7, which corresponds to seven astronauts selected for performance of this program. Already during preparation for the flight by Donald Slayton have found out the heart disease and Slayton was discharged of the further work on the program Mercury. Nevertheless Slayton has overcome the illness and, eventually, also has executed the space flight, but already under the program Apollo-Soyuz in 1975.

All manned flights under the Mercury program :

• Freedom 7
• Liberty Bell 7
• Friendship 7
• Aurora 7
• Sigma 7
• Faith 7

All astronauts of the Mercury program.