The U.S. Navy and shipbuilder General Dynamics NASSCO wrapped up sea trials of its fourth expeditionary ship, the USNS Hershel “Woody” Williams, on Jan. 19. The third and subsequent ships in the series are expeditionary sea bases, which have a flight deck that appears to be on stilts.

NASSCO and the Navy plan to lay the keel of its fifth such ship in late January. It is to be named after Miguel Keith, a U.S. Marine Corps lance corporal who died in Vietnam in 1970 and was awarded the Medal of Honor.

The expeditionary ships are 784 feet long.

NASSCO also has plans to build a series of oilers that will refuel Navy ships while at sea. On the commercial side of the business, NASSCO is at work on an 870-foot container ship for Matson Navigation Co. Inc. — one of two. The yard began the work in November.