Spectators watch the final fiery moments of the Starship test flight

SpaceX is gearing up for the first commercial launch of its powerful Falcon Heavy rocket as soon as early April with a communications satellite for Arabsat, and the U.S. Air Force hopes the two side boosters from the Arabsat mission can be safely landed and reused for the military’s first Falcon Heavy mission this summer, an exercise officials said will help certify previously-flown hardware for future national security launches.

This will be the eighth flight of the X-37B and the third time that it will be launched by SpaceX. The Falcon 9 rocket is scheduled to liftoff from Launch Complex 39A at 11:50 p.m. EDT (0350 UTC).

The 100th flight of America’s Evolved Expendable Launch Vehicle program — a United Launch Alliance Atlas 5 rocket — departed Cape Canaveral on Saturday evening carrying the most advanced U.S. weather satellite ever made.