Defense contractor BAE Systems won a $146 million contract for work on the USS Gettysburg, part of a class of guided-missile cruisers whose weapons and computer systems are undergoing upgrades to ensure they reach their 35-year service life.

Work on the Gettysburg, which will be performed at London-based BAE’s shipyard in Norfolk, Va., is scheduled for completion by 2020, and includes maintenance, modernization and repair, the U.S. Department of Defense said in a statement on Monday. The contract includes options that could bring its total value to $151.3 million.

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