 Current 118-meter length versions could house 4 to 32 VLS cells, each holding four RIM-162D Evolved Sea Sparrow Missiles or one SM-2 missile.For surface warfare, the 57mm gun could be replaced with a larger weapon up to the Mk 45 5-inch; integration of the AGM-114L Hellfire missile for defense against fast attack craft (FAC) was also factored in.Lockheed's approach was to integrate mission systems into the hull so that the ships could perform anti-submarine, anti-surface, and anti-aircraft duties without needing to swap out mission packages.