He was Commander Allied Naval Forces and the Seventh Fleet under General of the Army Douglas MacArthur in the Southwest Pacific Area, where he conducted numerous amphibious operations, and commanded an Allied fleet during the Battle of Leyte Gulf, largest naval battle of World War II and the last naval battle between battleships in history.
Ia adalah Komandan Angkatan Laut Sekutu dan Seventh Fleet di bawah kepemimpinan Jenderal Besar Douglas MacArthur di Kawasan Pasifik Barat Daya, dimana ia ikut serta dalam sejumlah operas amfibi, dan memngkomandani armada Sekutu saat Pertempuran Teluk Leyte, pertempuran angkatan laut terbesar pada Perang Dunia II dan pertempuran angkatan laut antar kapal tempur terakhir dalam sejarah.