Rear Admiral Harley H. Christy, USN. Portrait photograph, taken June 1929. At that time, he was Commander Battleship Division Three.
USS San Diego (Armored Cruiser No. 6) was sunk off Fire Island, New York, by a mine laid by German submarine U-156 on 19 July 1918. Captain Harley H. Christy commanded San Diego. The cruiser sank in 28 minutes with the loss of 6 lives and was the only major warship lost by the United States in World War I. Note, she was originally commissioned as USS California in August 1907 and was renamed in September 1914.