The federal technical and advisory solutions company Noblis on Monday said it has acquired McKean Defense in a deal that expands its defense work, particularly with the Navy, and significantly expands the size of the company.

Terms of the transaction were not disclosed.

Noblis, which is based in Northern Virginia, gains 625 employees from the deal, adding to its base of 1,250 personnel, and now boasts $418 million in annual sales. McKean Defense is based in Philadelphia and has locations elsewhere in the U.S.

Noblis said that McKean Defense has core capabilities in life-cycle management, engineering, enterprise transformation and program management. The company’s work with the Navy is in surface ship readiness, modernization, sustainment and integration.

McKean Defense and its affiliates, Mikros Systems and Cabrillo Technologies, are now a subsidiary of Noblis and will be led by Glenn Hickok, vice president of Noblis’ Defense Mission Area. Joseph Carlini, McKean’s CEO, will serve as a strategic advisor during the integration.

Noblis provides science, technology and strategy services to clients in defense, homeland security, intelligence and law enforcement, and federal civilian markets.

McKean’s financial advisor on the deal was Baird and Noblis was advised by Wolf Den Associates.