Imperial Japanese Navy Portrait photograph, taken circa the early 1940s. Lt. Tomonaga was Hiryu Air Group Commander during the Battle of Midway and was killed in action leading the torpedo attack on USS Yorktown (CV-5) on 4 June 1942. Collection of Captain Roger Pineau, USNR, 1975. He had obtained the photograph from Mrs. Tomonaga. U.S. Naval History and Heritage Command Photograph.