High Quality Content by WIKIPEDIA articles! USS Callaghan (DD/DDG-994) was the second ship of the Kidd class of destroyers operated by the U.S. Navy. Derived from the Spruance class, these vessels were designed for air defense in hot weather. She was named for Rear Admiral Daniel J. Callaghan, who was killed in action aboard his flagship, the heavy cruiser San Francisco, during the Naval Battle of Guadalcanal on 13 November 1942.