Jeffrey Nels Williams is a retired United States Army officer and a NASA astronaut. He is a veteran of four space flights and formerly held the American record for most days spent in space, which was surpassed in April 2017 by his colleague Peggy Whitson.

Stephanie Diana Wilson is an American engineer and a NASA astronaut. She flew to space onboard three Space Shuttle missions, and is the second African American woman to go into space, after Mae Jemison. Her 42 days in space are the most of any African American astronaut, male or female.

Garrett Erin Reisman is an American engineer and former NASA astronaut. He was a backup crew member for Expedition 15 and joined Expedition 16 aboard the International Space Station for a short time before becoming a member of Expedition 17. He returned to Earth on June 14, 2008 on board STS-124 on Space Shuttle Discovery. He was a member of the STS-132 mission that traveled to the International Space Station aboard Space Shuttle Atlantis from May 14 to 26, 2010. He is currently the Director of Space Operations at SpaceX and a Professor of Astronautics Practice at the University of Southern California's Viterbi School of Engineering.

Lee Joseph "Bru" Archambault is an American test pilot and former NASA astronaut. He has logged over 4,250 flight hours in more than 30 different aircraft. Archambault is married with three children. His hobbies include bicycling, weightlifting, and playing ice hockey. Archambault has received numerous awards and honors throughout his life. He has also flown two Space Shuttle missions, as pilot of STS-117 in 2007 and as commander of STS-119 in 2009. Archambault left NASA in 2013 after a 15-year career with the agency in order to become a test pilot for Sierra Nevada Corporation on their Dream Chaser orbital spaceplane project.

Gregory Carl "Ray J" Johnson is a former American naval officer and aviator, test pilot, aerospace engineer, and NASA astronaut. He spent his military career in both, the United States Navy and the Navy Reserve. He was the Pilot on Space Shuttle mission STS-125, the final Hubble Space Telescope servicing mission.

Gregory Harold "Box" Johnson is a retired NASA astronaut and a retired colonel in the United States Air Force. Johnson is a veteran of two space flights, STS-123 and STS-134. He served as pilot on his first mission, which delivered the Kibo logistics module and the Dextre robot arm to the International Space Station. Johnson was also assigned as the pilot to the STS-134 mission, which launched on May 16, 2011 and landed on June 1, 2011. Greg Johnson has also served in numerous roles for NASA including as a Capcom for several missions. At present time Gregory H. Johnson (Colonel, USAF, Ret.) is the President and Executive Director for the Center for the Advancement of Science in Space (CASIS).

William Anthony "Bill" Oefelein is an American test pilot instructor and former NASA astronaut who, on his only spaceflight, piloted the STS-116 Space Shuttle mission. Oefelein gained media attention on February 5, 2007 when fellow astronaut Lisa Nowak was arrested in Florida and charged with attempting to kidnap his girlfriend, U.S. Air Force Captain Colleen Shipman. Nowak later pleaded guilty to felony burglary and misdemeanor battery. Oefelein admitted to a two-year affair with Nowak, and he and Nowak became the first astronauts ever dismissed from NASA. Following the dismissals, NASA created its first astronaut Code of Conduct.

Alan Goodwin "Dex" Poindexter was an American naval officer and a NASA astronaut. Poindexter was selected in the 1998 NASA Group (G17) and went into orbit aboard Space Shuttle missions STS-122, and STS-131.

George David "Zambo" Zamka is an American NASA astronaut and United States Marine Corps pilot with over 3500 flight hours in more than 30 different aircraft. Zamka piloted the Space Shuttle Discovery in its October 2007 mission to the International Space Station and served as the commander of mission STS-130 in February 2010.

Clayton Conrad Anderson is a retired NASA astronaut. Launched on STS-117, he replaced Sunita Williams on June 10, 2007 as a member of the ISS Expedition 15 crew.

Tracy Caldwell Dyson is an American chemist and NASA astronaut. Caldwell Dyson was a Mission Specialist on Space Shuttle Endeavour flight STS-118 in August 2007. She was part of the Expedition 24 crew on the International Space Station between April 4, 2010 and September 25, 2010. She has completed three spacewalks, logging more than 22 hrs of EVA including work to replace a malfunctioning coolant pump.

Gregory Errol Chamitoff is an engineer and NASA astronaut. He was assigned to Expedition 17 and flew to the International Space Station on STS-124, launching 31 May 2008. He was in space for 6 months, joining Expedition 18 after Expedition 17 left the station. He returned to Earth on the 30th of November 2008 aboard STS-126. Chamitoff served as a mission specialist on the STS-134 mission, which was the last flight of Space Shuttle Endeavour which delivered the Alpha Magnetic Spectrometer to the ISS.