You test your engines while you develop them, but once they are production ready, you don't need to test them that much. But keeping the lights on means doing maintenance of the stands, tanks, etc.

United Launch Alliance (ULA) delivered the last-ever Space Launch System (SLS) Interim Cryogenic Propulsion Stage (ICPS) from its Decatur, Alabama, factory to Cape Canaveral Space Force Station (CCSFS ...

NASA's one of a kind ocean going barge Pegasus was upgrade from its role transporting External Fuel Tanks for the Space Shuttle program to the core booster stage of the SLS rocket when crews added an ...