A United Launch Alliance Atlas 5 rocket, designated AV-061, will launch the fifth Orbital Sciences Cygnus cargo freighter on its fourth operational cargo delivery flight to the International Space Station. The mission is known as OA-4. The rocket will fly in the 401 vehicle configuration with a four-meter fairing, no solid rocket boosters and a single-engine Centaur upper stage. The Atlas 5 Launch was delayed from Nov. 19.