Project Mercury also excluded civilian NASA X-15 pilot Neil Armstrong, though he had been selected by the US Air Force in 1958 for its Man In Space Soonest program, which was replaced by Mercury. Although Armstrong had been a combat-experienced NAP during the Korean War, he left active duty in 1952. Armstrong became NASA's first civilian astronaut in 1962 when he was selected for NASA's second group, and became the first man on the Moon in 1969. It was further stipulated that candidates should be between 25 and 40 years old, no taller than , and hold a college degree in a
Frank A. Armstrong 1930, and at Randolph Field, San Antonio, Texas, in 1931. In March 1934, he was one of a group of Army pilots placed under the command of Captain Ira Eaker. On October 1, 1934, he was promoted to 1st lieutenant. Armstrong was assigned in December 1934 as a pursuit pilot at Albrook Field, Panama Canal Zone. In 1937, Armstrong earned the Distinguished Flying Cross in peacetime by skillfully landing an amphibian airplane whose engine had exploded. He was promoted to the temporary rank of captain on March 15, 1936, returned to his permanent pay grade on June 16, and was