US Navy ships are built by anyone who wins a bid to build them. A lot of the odd ball ships are built in Mobile, Alabama and Pascagoula, Mississippi. Amphibs, helicopter carriers, patrol boats and even Higgins boats have been built there. Aircraft carriers and surface nuclear ships were usually build in NewPort News, Virginia. Subs were built in Connecticut. The littoral combat ships I've heard were built all over the world. They have been seen as a failure in concept, design, application and mission. That's not a reflection on the people who built them. More a problem with a congress that feeds money to their constituency instead of letting the Navy request and design for its actual needs.