According to SpaceX, the Demo-2 is the final major test for SpaceX's human spaceflight system to actually be certified by NASA for the new operational crew missions both to and from the esteemed International Space Station.
With the weather looking up, SpaceX and NASA officials vowed Tuesday to keep crew safety the top priority for the nation's first astronaut launch to orbit in almost a decade.
NASA will have input throughout the countdown, but in the end, it will be SpaceX giving the final go - with NASA's concurrence.
If the launch attempt May 30 gets scrubbed, the next day will serve as a backup. NASA confirmed there were "no issues" with the Falcon 9 rocket or Crew Dragon spacecraft.
President Donald Trump and Vice President Mike Pence will view the launch in person, a White House spokesman said.
Forecasters put the odds of acceptable launch weather at 40%.
Noguchi is expected to travel on the Crew Dragon with three other NASA astronauts for a long-duration mission aboard the ISS.
SpaceX and NASA will be paying close attention to the weather between now and Wednesday, and since this is a highly sensitive mission with actual astronauts on board the spacecraft, you can bet that they'll err on the side of caution for scrubbing the launch if weather isn't looking good.
Less than a month later, in January, SpaceX blew up one of its own rockets to prove, in an uncrewed "in-flight abort" test, that the Crew Dragon system can detect a fatal in-flight event and whisk astronauts away from danger.
SpaceX has been launching cargo capsules to the space station since 2012.
What was unforeseen at the time was that in six years NASA would cease using the Space Shuttle.
This is the culmination of many years' work, and will be the first human flight for the Commercial Crew program.
Even before the coronavirus took a bite out of the U.S. economy and therefore the government's budget, NASA repeatedly said it needed "reliable and cost-effective access to and from the International Space Station". Wednesday's launch will take the next step with commercially produced spacecraft carrying crew, and next they will be flying crew to commercially made and operated space stations.
If all goes according to plan, this is what will happen on Wednesday. "It did not seem likely at the time when we arrived in the astronaut office", said NASA astronaut Bob Behnken on Friday in his last news conference before the Demo-2 launch. Bridenstine said the United States is transforming the way it does space flight by commercializing low earth orbit.
The departure schedule for Behnken and Hurley to leave the ISS is in flux - NASA will provide that date, sometime between 6 weeks and 16 weeks from launch.