Stacking starts for Atlas 5 cargo run to space station with Cygnus

United Launch Alliance today began stacking its first Atlas 5 rocket to fly in service to the International Space Station, a commercial mission to send supplies to the orbiting complex. This launch, planned for Dec. 3, and another targeted for March 10, are precursors to the much larger role the Atlas 5 rocket will begin playing in International Space Station operations starting in 2017. That is when the Atlas will begin launching astronauts to the station inside Boeing-built Starliner space capsules for NASA. But first up will be unmanned cargo-delivery flights using Orbital ATK Cygnus freighters. The two rides aboard Atlas rockets were purchased by Orbital ATK as gap-fillers while working in parallel to return its Antares booster to flight by mid-2016. More

(Source: SpaceFlight Now - Nov 12)