The United Launch Alliance (ULA) Crew Flight Test dual engine, at left, and the Orbital Flight test dual engine, at right, for the Centaur stage of the Atlas V rocket are in production on June 11, 2018, at ULA's factory in Decatur, Alabama. Boeing's CST-100 Starliner will launch on its first uncrewed flight test on the ULA Atlas V rocket. The Starliner is being developed and manufactured in partnership with NASA's Commercial Crew Program to return human spaceflight capabilities to the U.S.