314th Air Division The 314th Air Division ( 314th AD ) is an inactive United States Air Force unit . Its last assignment was with Pacific Air Forces , based at Osan AB , South Korea . It became inactive in September 1986 . The unit ' s origins lie with the World War II 314th Bombardment Wing ( 314th BW ) , which was part of the Twentieth Air Force of the United States Army Air Forces . The 314th BW engaged in bombing operations against Japan using Boeing B - 29 Superfortress es . History . World War II . The 314th Bombardment Wing was activated in July 1944 at Peterson Field , Colorado as a command and control organization for four Boeing B - 29 Superfortress bombardment groups . The unit trained in Colorado while subordinate groups were trained in Kansas by the Second Air Force . When training was completed the 314th moved to Guam in the Mariana Islands of the Central Pacific Area in January 1945 The 314th was the fourth B - 29 Wing assigned to XXI Bomber Command , Twentieth Air Force . Its mission was the strategic bombardment of the Japanese Home Islands and the destruction of its war - making capability . In the Marianas , the Wing provided command and control to the 19th , 29th 39th and 330th Bombardment Groups . The 19th and 29th arrived in January ; the 39th and 330th in February . Its groups flew " shakedown " missions against Japanese targets on Moen Island , Truk , and other points in the Carolines and Marianas . The 19th began combat missions over Japan on 25 February 1945 with a firebombing mission over Northeast Tokyo ; the 29th with a firebombing mission over central Tokyo on March 9 . The 39th ' s first mission was an attack of the Hodagaya Chemical Works in Koriyama on 15 April ; the 330th hitting the same three days earlier on April 12 . The Division continued attacking urban areas until the end of the war in August 1945 ; its subordinate units conducted raids against strategic objectives , bombing aircraft factories ; chemical plants ; oil refineries ; and other targets in Japan . The wing flew its last combat missions on 14 August when hostilities ended . Afterwards , the wing ' s B 29s carried relief supplies to Allied prisoner of war camps in Japan and Manchuria . The 330th Bomb Group was relieved from assignment on 21 November , its personnel and equipment returning to the United States for demobilization ; the 39th in December . The other groups returned in May 1946 . The Wing then moved to Johnson Army Airbase , Japan in mid - May 1946 to become part of the Fifth Air Force Occupation forces . With the postwar consolidation of units , the organization was redesignated 314th Composite Wing in 1946 , having both groups and squadrons of varying missions assigned to the wing . For approximately two years ( 1946 – 1948 ) the 314th served as one of Fifth Air Force ' s major components . It maintained intensive training schedules , participated in training exercises and took part in the post - hostilities program of mapping Japan . Korean War . Activated at Nagoya AB , Japan , on 1 December 1950 as the 314th Air Division , the organization immediately assumed the missions of the air defense of Japan , logistical support for Fifth Air Force during the Korean War , and airfield construction in Japan . Units under the Division ' s direct jurisdiction during the Korean War were the following : On 1 March 1952 the 314th Air Division was stood down , as part of a Far East Air Force reorganization . Its units were reassigned to other organizations . Cold War . Reactivated in March 1955 at Osan Air Base , South Korea , the 314th Air Division was the primary command and control organization in South Korea for the next 30 years . The division maintained assigned and attached forces at a high degree of combat readiness during the Cold War . In fulfilling its mission , the division supported numerous military exercises in the region , such as Commando Bearcat , Commando Jade , and Commando Night . The Division was inactivated in 1986 by the decision to upgrade the organization to a Numbered Air Force level , being replaced by the reactivated Seventh Air Force , which assumed all of its assigned assets . Units assigned . United States Air Force . Wings Groups Squadrons