A United Launch Alliance Atlas 5 rocket, designated AV-064, launched the sixth Orbital Sciences Cygnus cargo freighter on its fifth operational cargo delivery flight to the International Space Station. The mission is known as OA-6. 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. Delayed from March 10 and March 20.
Launch site: SLC-41, Cape Canaveral Air Force Station, Florida