Rear Admiral David McDougal, USN, circa 1864-1871 when he was a captain (uniform has captain stripes based on uniform changes made during the Civil War).
Source:US Navy Historical Center
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This file is a work of a sailor or employee of the U.S. Navy, taken or made as part of that person's official duties. As a work of the U.S. federal government, it is in the public domain in the United States.