NASA Associate Administrator for the Human Exploration and Operations Mission Directorate William Gerstenmaier, right, escorts Expedition 56 flight engineer Serena Auñón-Chancellor as she prepares to board the Soyuz MS-09 spacecraft for launch, Wednesday, June 6, 2018 at the Baikonur Cosmodrome in Kazakhstan. Auñón-Chancellor and her crewmates Alexander Gerst of ESA (European Space Agency) and Sergey Prokopyev of Roscosmos will spend the next six months living and working aboard the International Space Station. Photo Credit: (NASA/Joel Kowsky)