We used to have a 600 ship navy during the days of Vietnam.
At its peak, the U.S. Navy was operating 6,768 ships on V-J Day in August 1945, including 28 aircraft carriers, 23 battleships, 71 escort carriers, 72 cruisers, over 232 submarines, 377 destroyers, and thousands of amphibious, supply and auxiliary ships - from “Ship Force Levels 1917-present”
Six Thousand Seven Hundred and Sixty Eight.....