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Pacific Theater of Operations
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The Pacific Theater of Operations (PTO) was the World War II area of military activity in the Pacific Ocean and the countries bordering it, a geographic scope that reflected the operational and administrative command structures of the American forces during that period.

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The Pacific Theater of Operations (PTO) was the World War II area of military activity in the Pacific Ocean and the countries bordering it, a geographic scope that reflected the operational and administrative command structures of the American forces during that period. (The other areas of the Pacific War -- the China Burma India Theater and the South-East Asian Theatre -- had their own respective command structures, independent of PTO.)
From mid-1942 until the end of the war in 1945, there were two operational commands in the PTO:
- Pacific Ocean Areas (POA; divided into Central Pacific Area, North Pacific Area and South Pacific Area), commanded by Admiral Chester Nimitz, Commander-in-Chief Pacific Ocean Areas
- South West Pacific Area (SWPA), commanded by General Douglas MacArthur, Supreme Allied Commander South West Pacific Area.
In addition, during 1945, General Carl Spaatz commanded the separate U.S. Strategic Air Forces in the Pacific.
Because of the complementary roles of the US Army and the Navy in conducting war in the Pacific theater, there was no single Allied or U.S. commander (comparable to Eisenhower in the ETO) for the PTO. Indeed, the organizational structure was rather complex, requiring the frequent involvement of the Joint Chiefs of Staff and the Army and Navy commanders each reporting to both the Secretary of War and the Secretary of the Navy. (The consolidation of their respective cabinet departments into the Department of Defense in 1947 addressed subsequent needs for control of joint operations on such large scales.)
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