United Launch Alliance's Vulcan Centaur lifted off for the third time ever in an experimental launch to put navigation ...

A United Launch Alliance Vulcan rocket is gearing up to carry a classified national security payload into space Tuesday night ...

A successful rocket launch this week could mean big things for two large defense companies that co-own the space company.

What was the mysterious white spiral flying in the night sky as stargazers looked up during the Perseid meteor shower peak ...

United Launch Alliance was supposed to fly its first national security mission on its new Vulcan rocket three years ago. It ...