Photos: Atlas 5 rolls out for launch

Boeing’s work on the International Space Station, the CST-100 Starliner commercial crew capsule and NASA’s heavy-lift Space Launch System are under the umbrella of John Elbon, who leads the company’s space exploration division in Houston.

Christopher Ferguson, commander of the final space shuttle flight and now a Boeing executive, has stepped down as commander of the first piloted test flight of the company’s troubled CST-100 Starliner commercial spacecraft, he and Boeing announced Wednesday. He has been replaced by NASA astronaut Barry “Butch” Wilmore.

Payload readiness has delayed next weekend’s planned Delta 4-Heavy rocket launch for the U.S. National Reconnaissance Office.