NASA has wasted no time in selecting the vehicle that will replace the upper stage on its new plans for a standardized Space Launch System rocket.
United Launch Alliance hoists a Centaur V upper stage atop the Vulcan first stage booster into the Vertical Integration Facility adjacent to Space Launch Complex-41 at Cape Canaveral Space Force ...
The only development it needs is a cone like the SLS LVSA (or SLS Block 1B USA) that goes from 9m to 5m diameter. SpaceX can probably have a flight test prototype welded up by the middle of next week.
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