SS Kokai Maru (1939)
 The Kokai Maru was a 3871 gross ton passenger cargo ship built by Hakodate Dock Company Hakodate Hokkaidō for Simatani Kisen Kabushiki Kaisha in 1939. She was requisitioned in 1941 by the Imperial Japanese Navy during World War II. On 10 March 1942 during the invasion of Lae-Salamaua Kokai Maru was damaged by SBD’s from the United States Navy aircraft carriers USS Lexington and USS Yorktown off Lae New Guinea.