What member of the Man in Space Soonest program became the seventh American in space?
Man in Space Soonest: Man In Space Soonest (MISS) was a United States Air Force (USAF) program to put a man into outer space before the Soviet Union. Man in Space Soonest:  Only two men from the program would actually reach outer space. Joseph A. Walker: Joseph Albert "Joe" Walker (February 20, 1921 – June 8, 1966) flew the world's first two spaceplane flights in 1963, thereby becoming the United States' seventh man in space.
i don't know