Can European naval systems replace US-sourced components?

Can European naval equipment in service with US-sourced parts be refitted with non-American components?

Yes, with enough money and redesign work; BAE's involvement in both Mark 41 and Type 45's Sylver installation shows that the industrial boundary is already transatlantic.

Replacing US-sourced parts is technically possible, but the cost and redesign effort determine whether it is practical. Launcher production shows why a simple national label can mislead: BAE's American arm makes Mark 41, while BAE also manufactured the Sylver cells fitted to Type 45. Decades of NATO interoperability created two-way dependence, with European components also present in American equipment. A retrofit program would therefore need to account for design knowledge, maintenance arrangements, and industrial ownership across national boundaries.