This is a list of persons who served aboard Space Shuttle crews, arranged in chronological order by mission. Abbreviations: * PC = Payload Commander * MSE = USAF Manned Spaceflight Engineer * Mir = Launched to be part of the crew of the Mir Space Station * ISS = Launched to be part of the crew of the International Space Station. Names of astronauts returning from the Mir or ISS on the Space Shuttle are shown in italics. They did not have specific crew roles, but are listed in the Payload Specialist columns for reasons of space.