Virgil Ivan "Gus" Grissom (April 3, 1926 – January 27, 1967) was an American engineer, pilot in the United States Air Force, and member of the Mercury Seven selected by National Aeronautics and Space Administration's (NASA) as Project Mercury astronauts to be the first Americans in outer space. He was a Project Gemini and an Apollo program astronaut. As a member of the NASA Astronaut Corps, Grissom was the second American to fly in space in 1961. He was also the second American to fly in space twice, preceded only by Joe Walker with his sub-orbital X-15 flights. Grissom was a World War II and Korean War veteran, mechanical engineer, and USAF test pilot. He was a recipient of the Distinguished Flying Cross, the Air Medal with an oak leaf cluster, two NASA Distinguished Service Medals, and, posthumously, the Congressional Space Medal of Honor. During World War II, Grissom enlisted in the U.S. Army Air Forces as an aviation cadet. After his discharge from military service, Grissom enrolled at Purdue University, graduating with a Bachelor of Science degree in mechanical engineering in 1950. He reenlisted in the U.S. Air Force, earning his pilot's wings in 1951, and flew 100 combat missions during the Korean War. After returning to the United States, Grissom was reassigned to work as a flight instructor at Bryan Air Force Base in Texas. He attended the U.S. Air Force Institute of Technology for a year, earning a bachelor's degree in aeromechanics, and received his test pilot training at Edwards Air Force Base in California before his assignment as a test pilot at Wright-Patterson Air Force Base in Ohio. Selected as one of the Mercury Seven astronauts, Grissom was the pilot of Mercury-Redstone 4 (Liberty Bell 7), the second American suborbital flight, on July 21, 1961. At the end of the flight, the capsule's hatch blew off prematurely after it landed in the Atlantic Ocean. Grissom was picked up by recovery helicopters, but the blown hatch caused the craft to fill with water and sink. His next flight was in the Project Gemini program as command pilot for Gemini 3 (Molly Brown), which was a successful three-orbit mission on March 23, 1965. Grissom, commander of AS-204 (Apollo 1), died along with his fellow astronauts Ed White and Roger B. Chaffee on January 27, 1967, during a pre-launch test for the Apollo 1 mission at Cape Kennedy, Florida.