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Dear Mr. Mitchell,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a Person Authority Record for Izac, Edouard (Edouard Victor Michel), 1891-1990 that may be your great grandfather. He is listed as a Notable Graduate by the U.S. Navy Academy and was buried in Arlington National Cemetery. All three descriptions indicate that he was awarded the Congressional Medal of Honor, the Croce di Guerra of Italy, and the Cross of Montenegro.
We hope this is helpful. Best of luck with your family research!