NASA is ready to start buying Vulcan rockets from United Launch Alliance
Briefly

The Vulcan rocket's successful first certification flight paved the way for ULA to compete for NASA contracts again, ending SpaceX's monopoly in large science missions.
ULA's inability to bid for NASA contracts was due to the sale of its Atlas V rockets, with the Vulcan required to complete a successful test flight first.
The US Space Force has already booked 25 launches on ULA's Vulcan rocket, but these military missions will only proceed after the second test flight's completion.
With the Vulcan rocket now certified for future contracts, NASA has more options for launching large missions, creating a more competitive environment for space launches.
Read at Ars Technica
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