The second flight of United Launch Alliance’s Vulcan rocket will take off in September with a dummy payload in place of Sierra Space’s Dream Chaser spaceplane, preserving a chance for ULA to begin launching US military satellites on the new rocket by the end of the year, officials announced Wednesday.
Tory Bruno, ULA’s CEO, announced the change in flight plan for the second Vulcan rocket in a conference call with reporters. There was little hope Sierra Space’s Dream Chaser would be ready to make its first resupply run to the International Space Station before the end of the summer
Global News 
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