On Wednesday, local time, NASA announced that due to the delay of Boeing's Starline spacecraft, the agency would redeploy two astronauts originally scheduled to perform the early tasks of the project to perform the commercial manned mission of SpaceX < p > Figure 1: on April 24, 2021, SpaceX manned dragon spacecraft sent four astronauts on NASA's second commercial manned mission to the International Space Station < / P > < p > NASA has reassigned American astronauts Nicole Mann and Josh Cassada to SpaceX's fifth commercial manned mission (crew-5), They are expected to travel to the international space station as early as autumn 2022 Both Mann and Cassada trained on Boeing's Starline spacecraft. Among them, Mann is preparing for the first manned test flight of the spacecraft and will dock with the international space station. Kasada is ready to carry out the first commercial operation mission of the Starline spacecraft < p > Figure 2: Nasa decided to transfer back astronauts Nicole Mann (left) and Josh Cassada from Boeing to perform SpaceX's fifth commercial manned mission < / P > < p > however, it is unclear when the Boeing spacecraft's first manned test flight and first commercial flight will take place. It must first pass the unmanned space station test mission before it can carry people. During the unmanned test flight in December 2019, the Boeing spacecraft encountered several failures, resulting in its inability to dock with the international space station as scheduled < p > Boeing originally planned to make a second attempt in late July this year to perform the mission called "orbital flight test 2" (oft-2), but during the pre launch inspection, it was found that there were problems with multiple valves of the spacecraft's propulsion system. NASA officials say the valve problem remains unresolved and oft-2 may eventually be postponed to 2022 < p > meanwhile, SpaceX has completed its first manned test flight and two official missions with Falcon 9 rocket and manned dragon spacecraft, and is preparing for the third commercial manned mission (crew-3) later this month < p > NASA officials said in a statement: "NASA believes that it is very important to reassign astronauts so that Boeing can have time to complete the development of Starline spacecraft and continue to provide astronauts with space flight experience to meet the needs of future missions." they added that other members of crew-5 will announce it later < p > crew-5 will be man and Kasada's first space flight. Mann said: "training on the new spacecraft (Boeing Starline spacecraft) is a rare opportunity in a lifetime, and it's great to work with the Boeing team. I'm glad to have the opportunity to receive training on SpaceX's manned dragon flying ship, and thank the NASA team for making it possible. I'm ready to fly to the international space station." < / P > < p > Cassada expressed similar views. He said: "the cross training of the two projects is a unique learning opportunity and provides valuable insight for future astronauts flying these spacecraft. Of course, Mann and I are very happy to work on the international space station, complete our current work and contribute to future exploration outside low earth orbit." (small) < / P > < p >