Project Mercury was the first successful manned spaceflight program of the US. It ran from 1959 through 1963 with the goal of putting a man in orbit around the Earth. The first Americans to venture into space were drawn from a group of 110 military pilots chosen for their flight test experience and their satisfaction of certain physical requirements; seven were selected to be astronauts in April 1959 and were quickly dubbed the “Mercury Seven.” How many of them went on to fly Mercury missions? Discuss