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James A. Dunn was a signalman on the USS Mason, a destroyer escort during World War II, the only oceangoing warship in the navy to employ African Americans in positions other than cook or messmate. Manned by African American seamen (and commanded by white officers) , the ship made ten crossings of the Atlantic from 1944 to 1945, escorting convoys of merchant ships to and from the United Kingdom and North Africa and operating in hunter-killer groups searching for German submarines. Dunn kept a day-to-day diary during his spare time on board the Mason. Such diaries are a rarity, for the navy (and other armed services) forbade the keeping of diaries, fearful lest secret information fall into enemy hands. The diary chronicles the Mason's wartime activities, from the first convoy to the final return to the United States.