NASA says the problem is related to the types of space suits currently available on the International Space Station. After a successful spacewalk with Hague on Friday, McClain realized that she was best suited to wear a medium-sized fiberglass upper shell. However, only one of these medium-sized spacesuit components can be used for the upcoming space walk. Koch plans to wear that, and McClain has no better choice.
According to previous plans, Friday's space walk will be led by women in space and on the ground. Kristen Facciol of the Canadian Space Agency will provide some support on the ground console. Mary Lawrence and Jackie Kagey will serve as chief flight instructors and EVA flight controllers, respectively.
NASA does not seem to be attempting an all-female space walk in the near future. Astronauts from the International Space Station will take three spacewalks in March and April to replace aging nickel-hydrogen batteries with new lithium-ion batteries. After the upcoming Friday spacewalk, McClain is likely to make his third spacewalk with Canadian astronaut David Saint-Jacques on April 8. However, NASA said it had not completed the final plan for the spacewalk mission, so things could still change.
So it's not clear when the first all-female spacewalk will take place. The first woman to walk in space was astronaut Svetlana Savitskaya, who worked outside the Soviet space station Salyut 7 (Salyut 7) in 1984. Since then, only 12 women have carried out space walks, and Koch will become the 14th female astronaut to carry out space walks. According to NASA, since 1998, astronauts have carried out 214 spacewalks on the International Space Station.