Huntington Ingalls Industries’ (HII) Ingalls Shipbuilding division has received a $1.50bn modification to a previously awarded contract.

The contract was for the procurement of the detail design and construction of landing platform dock (LPD) 31.

Under the fixed-price-incentive modification contract, the 15th in the San Antonio-class and the second Flight II LPD will be manufactured.

Ingalls Shipbuilding president Brian Cuccias said: “In building this 15th LPD, Ingalls experienced shipbuilders will continue this hot production line of great amphibious warships for our navy/Marine Corps team.

“We are all proud to be building these great ships, and will continue to deliver the most survivable and affordable ships possible for our customers and our nation.”

Ingalls Shipbuilding division has successfully delivered 11 San Antonio-class ships to the navy. Three more ships of the same class are currently under construction.

In August 2018, Ingalls Shipbuilding won an advanced procurement contract from the US Navy for the supply of a next-generation LPD 30.

The $165.5m valued contract was for the delivery of the first Flight II landing platform or dock.

Following the advance procurement contract, the contract for the design, construction and delivery of the vessel was awarded to the company in March last year.

The vendor base of Ingalls’ LPD Flight II programme comprises more than 600 manufacturers and suppliers in 39 states, including 387 small businesses.

More than 1,500 shipbuilders work on each LPD.

The 684-foot-long, 105-foot-wide San Antonio-class ships support a Marine Air Ground Task Force across a range of operations.