Bath Iron Works said the modification to the original contract awarded last year covers class and engineering services in regard to detail design and construction of the ships.
"With all three Zumwalt class ships now under construction, this award demonstrates the Navy's continued confidence in Bath Iron Works," said Bath Iron Works President Jeff Geiger.
"The contract enables us to continue supporting the construction of DDG 1000-class ships and allows us to maintain the critical shipyard skills needed to efficiently produce them.
"Zumwalt (DDG 1000) is over 60 percent complete and we are leveraging what we've learned in building the lead ship to support our DDG 1001 and 1002 construction efforts."
The company said it will continue to provide manufacturing support services such as engineering, design, production control, accuracy control and information technology, as well as program management, contract and financial management, procurement and configuration/data management.
The Zumwalt class guided missile destroyer features low radar profile, an integrated power system and a total ship computing infrastructure.