From left: Jim Maser, senior vice president of the Space Business Unit of Aerojet Rocketdyne; acting NASA Administrator Steve Jurzyck; John Bailey, associate director of NASA's Stennis Space Center; Rick Gilbrech, director of NASA's Stennis Space Center; Mike McDaniel, general manager of Aerojet Rocketdyne at Stennis Space Center; Amy Growder, chief operating officer of Aerojet Rocketdyne; Mary Byrd, associate director of NASAs Marshall Space Flight Center; and Jody Singer, director of NASA's Marshall Space Flight Center; pose for a picture giving a thumbs-up following a second hot fire test of the core stage for the first flight of NASAs Space Launch System rocket in the B-2 Test Stand, Thursday, March 18, 2021, at NASAs Stennis Space Center near Bay St. Louis, Mississippi. The four RS-25 engines fired for the full-duration of 8 minutes during the test and generated 1.6 million pounds of thrust. The hot fire test is the final stage of the Green Run test series, a comprehensive asse