General Dynamics Nassco, the only major shipyard on the West Coast, said it completed the hull for the first mobile landing platform ship for the U.S. Navy.

The last block of the MLP, made up of the ship’s exhaust stacks and weighing 277 short tons, was lifted onboard via crane and installed last month, and recently inspected. Outfitting and painting continues in preparation for the ship’s undocking in November.

Nassco, with about 3,200 employees in San Diego, has a contract to build three of the MLPs, which cost about $500 million each. The ships are a new class and serve as a “pier at sea,” a floating transfer station for troops and equipment in areas that do not have adequate port facilities.

The division of Virginia-based GD continues work on the 14th and final T-AKE cargo ship, which is scheduled to be delivered to the Navy later this year. The ships serve as transfer agents of supplies to other ships at sea.