Hans Koenigsmann, vice president for build and flight reliability at SpaceX, looking at a live feed of a SpaceX Falcon 9 rocket and Crew Dragon spacecraft during the countdown for a launch attempt of NASA's SpaceX Demo-2 mission on 27th May 2020. NASA's SpaceX Demo-2 mission is the first launch with astronauts of the SpaceX Crew Dragon spacecraft and Falcon 9 rocket to the International Space Station as part of the agency's Commercial Crew Program. The test flight serves as an end-to-end demonstration of SpaceX's crew transportation system. This launch was scrubbed due to bad weather, but was successfully rescheduled for 3:22 p.m. EDT on 30th May. Photographed in firing room four of the Launch Control Center at NASA's Kennedy Space Center, Florida, USA.