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A destroyer escort is a warship smaller than a destroyer. During World War II, destroyers were primarily fast fleet escorts, but their role evolved into antiaircraft escort due to threats from aircraft and submarines. Navies built specialized escorts for merchant convoys, with Britain developing corvettes and frigates, and the U.S. Navy creating the destroyer escort. Frigates, revived during World War II, were small escort ships used to protect convoys from submarines, equipped with sonar and depth charges. Modern frigates also have an antiaircraft role, incorporating radar and missiles, and often carry helicopters.123

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