Serco, Inc. on Thursday said it has completed its $225 million acquisition of Alion Science & Technology Corp.’s Naval business unit, a deal that adds about $336 million in annual sales, doubling the size of Serco’s business with the Navy.

Serco, Inc., the U.S-based business of Britain’s Serco Group plc, said the acquisition of the Naval Systems Business Unit (NSBU) gives it new capabilities in naval architecture, marine, structural and systems engineering, program management, production support, fleet readiness, and operational sustainment, allowing to provide the full spectrum of services to design, integrate and support maritime platforms.

The acquisition also provides it with new customers, including Naval Sea Systems Command and its program executive offices and surface and subsurface warfare centers. Additional customers include the Army for its watercraft, the Office of Naval Research, Coast Guard, and international navies. The deal also expands Serco’s work with the Royal Canadian Navy at the Vancouver shipyards.

“By combining our existing and new capabilities we have a very compelling proposition as an agile, services-first company able to take on the most complex naval modernization projects from stem-to-stern, and from conception all the way to sustainment and disposal of major naval platforms,” Dave Daquino, chairman and CEO of Serco, Inc., said in a statement. “We believe that Serco perfectly complements major naval OEMs as a hardware-neutral partner to assist our customers in transformative goals within strict cost and performance objectives. We are also thrilled that key management team members from the NSBU will be joining Serco to help sustain and grow the business.”

The NSBU has about 1,000 employees.