sentences:  Streetfighter evolved into the Littoral Combat Ship; under FSC the DD-21 became the DD(X) which would become the "Zumwalt" class destroyer, while the preliminary plans for CG-21 would be folded into the CG(X) ballistic missile defense cruiser.The hull of the "Zumwalt" class is similar to that of the DD-21, but the new design displaces 14,564 tons and unlike the DD-21, the deckhouse is flush to the sides of the hull.The central "block" of VLS cells is replaced by a peripheral VLS of 80 cells, which allows both guns to be located forward of the deckhouse.