English: SpaceX CEO and Chief Designer Elon Musk, left, NASA astronauts Victor Glover, Doug Hurley, Bob Behnken, NASA Administrator Jim Bridenstine, and NASA astronaut Mike Hopkins are seen inside the crew access arm with the SpaceX Crew Dragon spacecraft visible behind them during a tour of Launch Complex 39A before the early Sunday morning launch of the Demo-1 mission, Friday, March 1, 2019 at the Kennedy Space Center in Florida. The Demo-1 mission launched at 2:49am ET on Saturday, March 2 and was the first launch of a commercially built and operated American spacecraft and space system designed for humans as part of NASA's Commercial Crew Program. The mission will serve as an end-to-end test of the system's capabilities. Hurley and Behnken are assigned to fly onboard Crew Dragon for the Demo-2 mission and Glover and Hopkins have been assigned to fly to the International Space Station on Crew Dragon's first operational mission. Photo Credit: (NASA/Joel Kowsky)