During World War II, the United States Army Air Forces engaged in combat against the air, ground and naval forces of the Empire of Japan in the South West Pacific Theatre.
As defined by the United States Department of War, the South West Pacific theatre included the Philippines, the Dutch East Indies (excluding Sumatra), Borneo, Australia, the Australian Territory of New Guinea (including the Bismarck Archipelago), the western part of the Solomon Islands and some neighbouring territories. The theatre took its name from the major Allied command, which was known simply as the "South West Pacific Area".
The major USAAF combat organizations in the region was Fifth Air Force, based in Australia after the Battle of the Philippines (1941–42). From Australia, the Allied forces, led by General Douglas MacArthur, first moved north into New Guinea in 1942, then into the Netherlands East Indies in 1943, and returning to the Philippines in 1944 and 1945. Moving with the Allied ground forces, the USAAF Fifth Air Force established a series of airfields, some at existing facilities, but most were carved out of the jungle to provide tactical air support of the ground forces.
In addition to the Fifth Air Force units, elements of Seventh and Thirteenth Air Force advanced into the theatre as Japanese land and naval forces were driven out of the Central and South Pacific Areas.
Airfields and major unit assignments.
These airfields, and the headquarters of major units assigned (less Australia) were:
 ;templatestyles src="Col-begin/styles.css"/ ;
 ;templatestyles src="Col-begin/styles.css"/ ;
 ;templatestyles src="Col-begin/styles.css"/ ;
 ;templatestyles src="Col-begin/styles.css"/ ;