McClain and Koch were both in NASA's 2013 astronaut class, which had the second largest number of applications NASA has ever received, at over 6,100. The class provided them training and preparation for missions to low-Earth orbit, an asteroid and Mars. Half the 2013 class was women, as was NASA's most recent class of flight directors.
It will be McClain's first time in space, and Koch's first spaceflight.
McClain has flown over 2,000 hours in 20 different aircraft, and is currently part of the Expedition 58/59 crew that launched to the International Space Station in December 2018. Koch will serve aboard the International Space Station as a flight engineer for the expedition, as she has background in both space science instrument development and scientific field engineering.
"When you are finally in space and you're finally looking back at Earth and you realize for the first time in your life there's nothing standing between you and your dream, it's just so hard to describe the profound impact of that," McClain told NPR in February.
Spacewalks are organized to conduct work outside a spacecraft, do experiments, test new equipment or repair satellites or spacecraft already in space. The March spacewalk will last about seven hours, according to NASA.
And spacewalks are relatively rare events. There have been only 213 at the International Space Station since December 1998, so history has favored male dominated spacewalks. A NASA spokesperson who confirmed the historical significance of the spacewalk told Axios that it was "not orchestrated to be this way."
Facciol, who will be on console from NASA's Johnson Space Center in Houston, tweeted her excitement about the historic moment: "I just found out that I'll be on console providing support for the FIRST ALL FEMALE SPACEWALK..."
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