The second USS Mystery (ID-2744), often identified as SP-2744, was a minesweeper support ship that served in the United States Navy from 1918 to 1919. Mystery was built in 1886 by A. G. Brown at Tottenville, New York, as a commercial fishing trawler. The 3rd Naval District inspected her on 7 May 1918 for possible World War I U.S. Navy service. The Navy chartered her from Empire Water Co., Inc., of New York City on 18 July 1918, took her over 20 August 1918, assigned her Identification Number (ID. No. 2744) and commissioned her as USS Mystery (ID-2744) on 2 September 1918. Confusingly, the designation "SP-2744" was painted on her bow and this designation is reported as her official one by many sources, although this contradicted her official data card, which identifies her as "Id. No. 2744,