BATH, Maine — Bath Iron Works on Monday was awarded a $24.4 million Department of Defense contract modification for additional detail design and construction of the Navy’s latest class of destroyers.

The announcement comes one week before the christening of the first of three DDG 1000 “stealth destroyers” being built by the Bath shipyard.

The $4 billion USS Zumwalt will be christened at Bath Iron Works on April 12.

According to the Department of Defense, the contract modification “will provide technical and industrial engineering in the interpretation and application of the detail design to support construction and the maintenance of the ship design.”

Bath Iron Works is building three DDG 1000s for the U.S. Navy. Construction of the Zumwalt, named for Adm. Elmo R. “Bud” Zumwalt Jr., began in February 2009, and the ceremonial keel laying took place in November 2011.

The DDG 1001, the future USS Michael Monsoor, is scheduled for delivery to the Navy in early 2015, and the third warship, the DDG 1002 to be named the USS Lyndon B. Johnson, is due in 2018.