Malcolm Scott Carpenter (May 1, 1925 – October 10, 2013) was an American naval officer and aviator, test pilot, aeronautical engineer, astronaut, and aquanaut. He was one of the Mercury Seven astronauts selected for NASA's Project Mercury in April 1959. Carpenter was the second American (after John Glenn) to orbit the Earth and the fourth American in space, after Alan Shepard, Gus Grissom, and Glenn.
Commissioned into the U.S. Navy in 1949, Carpenter became a naval aviator, flying a Lockheed P-2 Neptune with Patrol Squadron 6 (VP-6) on reconnaissance and anti-submarine warfare missions along the coasts of the Soviet Union and China during the Korean War and the Cold War. In 1954, he attended the U.S. Naval Test Pilot School at NAS Patuxent River, Maryland, and became a test pilot. In 1958, he was named Air Intelligence Officer of USS Hornet, which was then in dry dock at the Bremerton Navy Yard.
The following year, Carpenter was selected as one of the Mercury Seven astronauts. He was backup to Glenn during the latter's Mercury Atlas 6 orbital mission. Carpenter flew the next mission, Mercury Atlas 7, in the spacecraft he named Aurora 7.