States Army Air Forces (USAAF) units widely deployed throughout the southwest Pacific in World War II. On 15 June 1945, Fifth Air Force, Clark Field, Luzon, Philippines; Seventh Air Force, Hickam Field, Hawaii, USA; and Thirteenth Air Force, Clark Field, Luzon, Philippines were assigned to FEAF to support combat operations in the Pacific. With the end of World War II in September 1945, the USAAF found its units deployed throughout the Pacific, from Hawaii to India, from Japan to Australia, and based on a hundred island airstrips, along with bases in China and Burma. A realignment of these forces was needed by the USAAF to better organize its forces in the Pacific for peacetime. On 6 December 1945, Far East Air Forces was redesignated Pacific Air Command, United States Army (PACUSA), and its Air Forces were redeployed as follows: Fifth Air Force: Assigned to Tokyo, Japan Primary mission performing allied occupational assistance on the Japanese Home Islands and the Korean peninsula. Seventh Air Force: Assigned to Hickam Field, Hawaii Returning to its prewar mission for the defense of the Hawaiian Islands, including Midway Island; the Marshall Islands and other Central Pacific islands Eighth Air Force: Assigned to Kadena Army Air Base, Okinawa Defense of the Ryukyu Islands, including Iwo Jima Thirteenth Air Force: Assigned to Clark Field, Philippines Defense of the Philippines, New Guinea and the Solomon Islands Twentieth Air Force: Assigned to Harmon Field, Guam, Mariana Islands Reassigned to PACUSA 6 December 1945; provided a strategic deterrent for the entire Western Pacific region With this realignment and reassignment of forces, PACUSA controlled and commanded all United States Army Air Forces in the Far East and Southwest Pacific, and all air forces were placed under one Air Force commander for the first time. In November 1945, the 509th Composite Group left North Field on the island of Tinian and was reassigned to Roswell Army Air Field, New Mexico, taking the atomic bomb delivery capability of PACUSA to the United States. Shortly afterwards, Eighth Air Force was reassigned to the newly established Strategic Air Command (SAC) on 7 June 1946 and its strategic units reassigned to the 1st Bombardment Division. The major mission of PACUSA in the postwar years (1946–1950) was occupation duty in Japan and the demilitarization of the Japanese society in conjunction with the United States Army. In addition, PACUSA helped to support atomic bomb testing in the Pacific