SpaceX Crew-3 Dress Rehearsal

William Gerstenmaier, vice president for Build and Flight Reliability at SpaceX, left, and Richard Jones, manager of the Mission Management and Integration Office for NASA's Commercial Crew Program, monitor the countdown during a dress rehearsal in preparation for the launch of a SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft on NASA’s SpaceX Crew-3 mission with NASA astronauts Raja Chari, Tom Marshburn, Kayla Barron, and ESA (European Space Agency) astronaut Matthias Maure