ISA Astronaut Group 21

ISA Astronaut Group 21 ("The Aces") was a group of 44 astronauts announced by the ISA on December 14, 2017. The class was nicknamed "The Sardines" for being such a large class, humorously implying that their training sessions would be as tightly packed as sardines in a can. These 44 candidates compose the largest astronaut class to date. NASA selected so many candidates in preparation for the anticipated need for ISS crew members, along with regular shuttle needs.

Pilots

• Ramlah Al-Hashim (Asiatic Cheetah) (United Arab Emirates)

STS-250 — Space Shuttle Horizon (Hubble Space Telescope servicing mission)

(Born: Abu Dhabi, UAE) F-16 pilot with the UAEAF. Multiple successful combat sorties over Syria against ISIS targets.

• Duane G. Carey (1 flight)

STS-109 Template:OV (Hubble Space Telescope servicing mission; Columbia's last successful flight)

• Stephen Frick (2 flights)

STS-110 Template:OV (ISS assembly mission – launched the S0 Truss Segment)

STS-122 Template:OV (ISS assembly mission – launched the Columbus Laboratory)

Mission specialists

• David M. Brown (1 flight; died in the Space Shuttle Columbia disaster)

STS-107 Template:OV (orbital science mission; last flight of Space Shuttle Columbia – RCC panel damage resulted in disintegration of Columbia)

• Daniel C. Burbank (2 flights)

STS-106 Template:OV (ISS supply mission)

STS-115 Template:OV (ISS assembly mission – launched the P3/P4 Truss Assemblies)

International mission specialists

• Ingrid Rita Bernadotte (Eurasian Lynx) (ESA, Sweden)

STS-250 — Space Shuttle Horizon (Hubble Space Telescope servicing mission)

(Born: Stockholm, SWE) Member of the Swedish royal family; currently 8th in line of succession. Sikorsky UH-60 Black Hawk helicopter pilot with Swedish Air Force. Master's degree in aerospace engineering.