The following excerpt is from the NASA website:
“WASHINGTON -- NASA's partnership with industry to develop transportation to the International Space Station reaches another milestone on Wednesday, Aug. 24. The cargo module for Orbital Sciences Corp.'s Cygnus spacecraft, which will carry supplies to the station, is scheduled to arrive at NASA's Wallops Flight Facility in Virginia.
During the next several months, Orbital's engineering team will integrate the PCM with the Cygnus service module that includes the spacecraft's avionics, propulsion and power systems.
The Cygnus spacecraft is scheduled for a demonstration flight early next year on an Orbital Taurus II launch vehicle under NASA's Commercial Orbital Transportation Services agreement with the company.”
