Southwest Pacific Area
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Under the command of General of the Army Douglas MacArthur, the Southwest Pacific Area (SWPA) was a World War II theater of operations that extended north through the Philippines and New Guinea, south through Alaska, and west to Singapore. Its eastern border included parts of the Solomons Islands.
The existence of the area, to some extent, reflected the original Japanese barrier between Hawaii and Australia, but also reflected the interservice rivalries between the U.S. Army and U.S. Navy, and the ego of MacArthur.
Australian forces in the theater were subordinated to the SWPA headquarters, although Australia still dealt directly with its troops in the Mediterranean.