After NASA canceled the plan to send the next crew to the ISS, the eagerly anticipated return of NASA astronauts Butch Wilmore and Sunita Williams to Earth was postponed once more.

NASA chose to cancel the project in order to give more time to troubleshoot a hydraulics problem with the ground system, since the countdown was only 45 minutes before launch. Wilmore and Sunita Williams, along with two other departing space station crew members, are expected to return in at least two more days.

Crew-10 commanders to replace Sunita & Wilmore:

Crew-10 commander Anne MCClain, pilot Nichole Ayers, Japanese astronaut Takuya Onishi and Russian cosmonaut Kirill Peskov were strapped in and ready for blastoff from historic pad 39 at the Kennedy Space Center.

But throughout the final few hours of the countdown, SpaceX engineers were troubleshooting an apparent problem with one of two clamp arms that hold the Falcon 9 rocket to its launch support gantry.