What modern escort fleets lose when one ship must do everything

Using an Arleigh Burke for every presence or maritime-security task consumes high-end ships on missions a cheaper frigate could perform. The Constellation-class programme points toward the lower-cost frigate tier that the US Navy needs. The opposite problem appears when a task exceeds one destroyer's capacity and no larger surface combatant exists, forcing the navy to commit a second scarce ship. That missing middle tier resembles the sailing Royal Navy's concentration of numbers in third and fifth rates rather than first-rate ships. The S class also appears partly as a product of treaty limits, yet it suited Britain's need to use yards and skills that sat between small-boat and top-end construction. The modern comparison turns to British Type 45 numbers and the planned division of labour among Type 31, Type 26, and future Type 83 escorts. The lesson is that balanced force structure needs several capability levels in sufficient numbers.