There were 2 CNO's during the period between 1939 and 1945 covering WWII:
Admiral Harold R. Stark - August 1, 1939 - March 2, 1942
Fleet Admiral Ernest J. King - March 2, 1942 - December 15, 1945
Stark relieved Admiral William Leahy - King was relieved by former CINCPAC Chester W. Nimitz.
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The buck stopped with Fleet Admiral Chester Nimitz, whose WWII titles included the dual command of Commander in Chief, US Pacific Fleet for U.S. naval forces and Commander in Chief, Pacific Ocean Areas for U.S. and Allied air, land, and sea forces.
Jutland is the only significant naval battle or World War I
The joint operations of the Allied army and naval forces in the disastrous Gallipoli campaign (1915) of World War I
Pearl Harbor
3. Patton