The vessel is the USS John F. Kennedy, a Gerald R. Ford class aircraft carrier which is in pre-construction phase.
The additional work by HII's shipbuilding division, Newport News Shipbuilding, includes manufacturing efforts and will continue until the end of October.
The extension announced by the U.S. Department of Defense is worth $407 million.
"This is a critical phase of construction on John F. Kennedy as key material procurement and production activities are taking place every day," said Mike Shawcross, NNS vice president, CVN 79 construction. "It is very important to get a good start on a ship of this magnitude and complexity and this contract extension allows for those activities to continue and keep the ship on a path for success in meeting our customer's goals."
A full construction contract for the carrier is expected to be awarded by the Navy this year.