Soemu Toyoda
The Z Plan documents were in plain text, rather than code, and were translated on an urgent basis by the top five translators at the Military Intelligence Service attached to the Allied Translator and Interpreter Section, it was first translated by Yoshikazu Yamada and George "Sankey" Yamashiro, two nisei translators. Copies of the translation were rushed to General Douglas MacArthur, who quickly forwarded them to Admiral Chester Nimitz, commander-in-chief of the Pacific Fleet (and Admiral Koga's counterpart). Among other things, planned Japanese diversionary tactics were now anticipated by the Americans, leading to the lopsided American victory in the Battle of the Philippine Sea, the largest aircraft carrier battle in history, and one of the decisive battles of the Pacific war. After the loss of the plans, Admiral Soemu Toyoda, Koga's successor, rewrote the plans in a more aggressive manner and named it Operation A-Go.