Watch live video of the Solar Orbiter launch pad at Cape Canaveral (members only)

The ocean-sailing ship that transports rocket stages from United Launch Alliance’s factory to U.S. launch sites completed its latest voyage overnight, pulling into port to deliver the Atlas 5 that will send a cargo freighter to the International Space Station in March.

As the internal investigation continues into the first stage performance trouble on the last Atlas 5 rocket launch, the next mission on the manifest has slipped to May 27.

Boeing said Wednesday it has turned down an offer from Aerojet Rocketdyne to buy United Launch Alliance, a Boeing-Lockheed Martin joint venture that operates the Atlas and Delta rocket fleets.