The U.S. Navy has indicated it wants a fifth expeditionary warfare ship from General Dynamics NASSCO.

The Pentagon announced May 31 that the Navy issued a $106.2 million contract to buy components that will go into Expeditionary Mobile Base 5 — part of a series of ships previously known as the Mobile Landing Platforms and Afloat Forward Staging Bases.

NASSCO has not yet received an actual contract for a fifth ship, a company spokesman said.

This action lets the Barrio Logan yard buy components such as engines, propeller and shafting, integrated bridge electronics, centrifugal pumps, fuel and lube oil purifiers and steering gear components.

The Naval Sea Systems Command of Washington, D.C. awarded the contract. The work was not put out to bid because the Pentagon determined there was only one responsible source for the project, and no other supplies or services could satisfy Navy requirements.

Shares of NASSCO’s parent company, General Dynamics, trade on the New York Stock Exchange under the symbol GD.

Military leaders plan to use Expeditionary Mobile Base ships as floating bases that U.S. Marines or special operations units can use for amphibious landings or other missions.

NASSCO is working on five commercial ships as well as the fourth Expeditionary Mobile Base. The contract for the fifth Expeditionary Mobile Base — to be built around the newly ordered components — could come later this year.