USAAF Twentieth Air Force

USAAF Twentieth Air Force
Unit name	Twentieth Air Force
Caption	B-29 Superfortress of Twentieth Air Force
Dates	1944–1945
Country	United States
Branch	United States Army Air Forces
Role	Strategic bombing
Garrison	Wright Field, Wright-Patterson Air Force Base
Notable commanders	General Henry H. Arnold, General Curtis LeMay

USAAF Twentieth Air Force The Twentieth Air Force was a strategic bombing component of the United States Army Air Forces activated in 1944 to prosecute aerial campaigns against the Empire of Japan, integrating long-range B-29 Superfortress operations with theater logistics. It coordinated with Pacific theater commands, worked alongside units from the United States Navy, United States Marine Corps, and Allied air forces such as the Royal Air Force and Royal Australian Air Force, and conducted missions that influenced the conclusion of World War II in the Pacific.

History

Formed under directives from the Joint Chiefs of Staff and the Army Air Forces Strategic Air Force Planning Board, the Twentieth Air Force emerged from planning at Wright Field and Washington, D.C. amid debates between leaders including General Henry H. Arnold, Admiral Ernest King, and planners tied to the War Department. Initial organization drew on personnel and doctrine from Eighth Air Force and training units at Kearney Army Air Field, Dalhart Army Air Field, and Grand Island Army Air Field. As forward bases in the Central Pacific and China Burma India Theater became available, Twentieth Air Force elements executed the Operation Matterhorn plan using staging fields at Chengdu and logistics lines through Calcutta and Kunming. Leadership disputes involving figures like General Douglas MacArthur and General George C. Marshall shaped basing and target selection, culminating in concentrated attacks from newly captured islands including Tinian, Saipan, and Iwo Jima.

Organization and Structure

The Twentieth Air Force was organized into numbered combat wings and bombardment groups, notably the 58th Bombardment Wing, 313th Bombardment Wing, and 315th Bombardment Wing, each comprising groups such as the 6th Bombardment Group, 9th Bombardment Group, and 504th Bombardment Group. Support elements included maintenance and logistics units drawn from Air Transport Command, Army Service Forces, and theater logistics hubs at Hickam Field and Andersen Air Force Base. Command relationships intersected with theater commands like United States Pacific Fleet and General Douglas MacArthur's area, while operational control sometimes involved liaison with the U.S. Joint Chiefs of Staff and planning staffs at Pacific Ocean Areas. Tactical and strategic intelligence support came from Office of Strategic Services-linked analysts and Signal Intelligence Service intercept units.

Aircraft and Equipment

The primary aircraft was the Boeing B-29 Superfortress, supported by reconnaissance variants such as the B-29F and specialized models used in incendiary and photographic missions. Escort and utility support involved aircraft like the P-51 Mustang, P-38 Lightning, and transport types including the C-47 Skytrain and C-54 Skymaster. Armament and ordnance included the AN-M-69 incendiary bomb, "Little Boy", "Fat Man", and conventional high-explosive bombs delivered via Norden-type bombing patterns adapted for high-altitude operations. Ground support and maintenance used equipment from Wright Field production testbeds and depot systems at Oklahoma City Air Depot and Ogden Air Depot.

Major Operations and Campaigns

Twentieth Air Force actions included the early strategic raids under Operation Matterhorn against Japanese industrial targets in Manchuria, followed by island-based campaigns from the Marianas that intensified strategic bombing against Tokyo and other population centers in the Home Islands. The force executed the nighttime incendiary raids planned by commanders including Curtis LeMay, culminating in the devastating Tokyo firebombing and coordinated strikes on Kobe, Osaka, and Yokohama. Twentieth Air Force units also supported the Battle of Okinawa by interdiction missions and provided reconnaissance for carrier and amphibious operations linked to Operation Downfall planning. The culmination of the Twentieth Air Force role included the delivery of the Manhattan Project weapons on Hiroshima and Nagasaki, missions that directly intersected with scientists and military staff from Los Alamos Laboratory, Trinity test site planners, and Vice Admiral William H. P. Blandy-coordinated target assessment teams.

Bases and Stations

Operational staging and main bases included North Field (Tinian), West Field (Tinian), Wheeler Field, Kadena Airfield, and forward staging sites on Iwo Jima and Saipan. Training and logistics hubs in the continental United States encompassed Wichita Army Air Field, Barksdale Field, Dalhart Army Air Field, and depots at Oklahoma City Air Depot and Ogden Air Depot. Overseas logistical nodes and ferry routes passed through Honolulu, Guam, Manila, and the China Burma India Theater airlift corridors via Chungking and Kunming.

Commanders

Twentieth Air Force command involved senior leaders such as General Henry H. Arnold in authorization and oversight, with operational leadership by officers including General Curtis LeMay who reshaped tactics, and senior staff interactions with planners like General George C. Kenney, Lieutenant General Claire Lee Chennault-linked advisors, and logistics directors from Army Service Forces. Liaison and joint coordination included figures from the United States Navy command such as Admiral William F. Halsey Jr. and political-military authorities including President Harry S. Truman near the close of hostilities.

Legacy and Impact

The Twentieth Air Force influenced postwar strategic aviation doctrine embodied in institutions like the United States Air Force and shaped Cold War-era organizations including Strategic Air Command and NATO air strategy. Technological and organizational legacies extended to aircraft development programs at Wright-Patterson Air Force Base, nuclear weapons policy debates involving the Baruch Plan and United Nations disarmament efforts, and historiography preserved in archives at the National Archives and museums such as the National Museum of the United States Air Force. The operational record informed later discussions on airpower ethics, civil defense initiatives tied to Federal Civil Defense Administration, and international law deliberations at forums like the Nuremberg Trials and United Nations General Assembly sessions concerning aerial bombardment.

Category:United States Army Air Forces Category:World War II air units