Bayou Metals, a manufacturing partner of defense shipbuilder Huntington Ingalls Industries (HII), has stood up a dedicated production line for the Romulus uncrewed surface vessel (USV), a move intended to compress delivery timelines and increase throughput for the US Navy’s growing unmanned maritime program.

The production line is located in Slidell, Louisiana. Bayou Metals is also serving as a strategic marine-grade aluminum supplier to the HII. 

A purpose-built line for an uncrewed hull

Rather than routing Romulus components through a generalized fabrication workflow, Bayou Metals configured a dedicated manufacturing line specifically for the vessel’s metalwork and structural assemblies. This single-product-line architecture reduces setup changeover time and allows process engineers to optimize fixturing, weld sequencing, and quality inspection around a single repeating geometry—a standard lean-manufacturing approach when volume and schedule pressure justify the capital allocation.

The Romulus family of USVs is designed for a wide range of mission sets, including intelligence, surveillance, and reconnaissance (ISR), mine countermeasures, strike operations, and counter-unmanned systems. It can also serve as a mother-ship to launch and recover unmanned underwater vehicles (UUVs) and unmanned aerial vehicles (UAVs). It is centered on HII’s Odyssey autonomy software suite and open systems architecture.

HII has been developing the platform as part of the broader US Navy push to field autonomous and semi-autonomous surface vessels capable of operating alongside crewed combatants. Romulus is being developed in partnership with Breaux Brothers, Shield AI, Beier Integrated Systems, and Incat Crowther. 

Supply chain structure for unmanned programs

The Bayou Metals arrangement illustrates how prime defense contractors are structuring supply chains for unmanned platforms differently from traditional crewed ships. Because USVs are expected to be procured in larger numbers at lower per-unit cost than destroyers or frigates, the production economics demand a more industrialized approach from tier-one and tier-two suppliers early in the program lifecycle — before the Navy has necessarily committed to a high-rate production contract.

HII’s unmanned systems portfolio

HII has been expanding its unmanned and autonomous systems work through its Mission Technologies division, positioning itself beyond traditional nuclear shipbuilding. The Romulus program sits within that strategic push.

By anchoring a dedicated supplier line, HII is attempting to demonstrate production readiness — a factor the Navy weighs when evaluating whether a program can transition from development and low-rate initial production to full-rate procurement.

Production readiness reviews assess not just the prime contractor’s internal capacity but the depth and reliability of the supplier base. A named, dedicated manufacturing line at a partner facility is a tangible data point in that evaluation criteria. 

What comes next

In addition to the vessel currently under construction, four additional Romulus 151 vessels will be built by Breaux Brothers Enterprises in Louisiana. This effort for HII also supports the expansion of the U.S. shipbuilding industrial base by growing Gulf Coast manufacturing capacity.