John Glenn was the first US man to orbit the Earth as part of Project Mercury. Project Mercury sent six spacecraft into orbit from 1961 to 1963 each performing onboard experiments, staying out in orbit just a bit longer, and testing the entire Mercury Space Flight Network (MSFN).
John Glenn was the first U.S. man to orbit the Earth as part of Project Mercury. Project Mercury sent six spacecraft into orbit from 1961 to 1963 each performing onboard experiments, staying out in orbit just a bit longer, and testing the entire Mercury Space Flight Network (MSFN).