A rocket engine that could power United Launch Alliance’s next-generation rocket has passed a major design review, clearing the way for full-scale hotfire testing starting next year and certification for test flights in 2019, according to Aerojet Rocketdyne, the powerplant’s developer.

U.S. military officials and United Launch Alliance have dedicated the planned launch Saturday of an Atlas 5 rocket with the military’s winged mini-space shuttle to coronavirus first responders, front-line workers and all who have been affected by the pandemic.

NASA’s Perseverance rover will depart Cape Canaveral Thursday on a $2.7 billion mission to Mars, carrying with it the first interplanetary aircraft, sophisticated instruments to search for signs of ancient life, and drill to core samples for eventual return to Earth.