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Dear Mr. Irvine,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located digitized 2 file units in the series titled World War II War Diaries, Other Operational Records and Histories, ca. 1/1/1942 - ca. 6/1/1946 in the Records of the Office of the Chief of Naval Operations (Record Group 38) that include U.S. Navy actions that occurred near Siargao Island.
We hope this is helpful. Best of luck with your research!