To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

421st Air Refueling Squadron

From Wikipedia, the free encyclopedia

421st Air Refueling Squadron
421st ARS Boeing YKB-29T-90-BW Superfortress 1954.jpg
Experimental Boeing YKB-29T Superfortress 45-21734 of the 421st Air Refueling Squadron at Yokota AB, 1954
Active1944–1946; 1953–1965
Country United States
Branch United States Air Force
RoleAerial refueling
DecorationsDistinguished Unit Citation
Air Force Outstanding Unit Award
421st Air Refueling Squadron Emblem
(approved 1 March 1962)
421st Air Refueling Squadron - Emblem.png
421st Air Refueling Squadron Emblem (approved 18 June 1954)
421 Air Ref Sq (early).PNG
421st Bombardment Squadron, Very Heavy emblem (approved 2 November 1944)[1]
421st Bombardment Squadron - Emblem.png

The 421st Air Refueling Squadron is an inactive United States Air Force unit. It was last assigned to the 41st Air Division at Yokota Air Base, Japan, where it was inactivated on 18 February 1965.

In 1985 the squadron was consolidated with the 421st Bombardment Squadron, Very Heavy, a World War II very heavy bombardment squadron that participated in the air offensive against Japan with Twentieth Air Force before moving to Clark Field, Philippines, where it was inactivated in 1946. Since consolidation the squadron has not been active.


World War II

The 421st Bombardment Squadron was activated on paper in March 1944 at Dalhart Army Air Field, Texas as a Boeing B-29 Superfortress very heavy bombardment squadron.[1] It moved to Fairmont Army Air Field, Nebraska the day after activation, where it received its initial cadre from the 9th Bombardment Group. Because of aircraft availability, initial training missions were flown with Boeing B-17 Flying Fortress aircraft.[2] Once the squadron competed training, it moved to North Field, Tinian in the Mariana Islands of the central Pacific area in January 1945 and became part of the XXI Bomber Command of Twentieth Air Force.[1] Its mission was the strategic bombardment of the Japanese Home Islands and the destruction of Japan's war-making capability.

The 421st flew "shakedown" missions against Japanese targets on Moen Island, Truk,[3] and other points in the Carolines and Marianas. The squadron began combat missions over Japan on 25 February 1945, with a firebombing mission over northeast Tokyo. The 421st continued to participate in wide area firebombing attack, but the first ten-day blitz resulted in the command running out of incendiary bombs. After that, the squadron flew conventional bombing missions using high explosive bombs. The squadron earned two Distinguished Unit Citations for its attack on the industrial center of Yokohama in May 1945, and mining shipping lanes in the Shimonoseki Strait between Korea and Japan in July and August.[1][3]

The squadron continued attacking urban areas of major Japanese cities with incendiary ordnance until the end of the war in August 1945, causing massive destruction of urbanized areas. It also conducted raids against strategic objectives, bombing aircraft factories, chemical plants, oil refineries, and other targets in Japan. The squadron flew its last combat missions on 14 August, when hostilities ended. Afterwards, its B-29s carried relief supplies to Allied prisoner of war camps in Japan and Manchuria.[verification needed]

The squadron was largely demobilized on Tinian during the fall of 1945. It remained in the western Pacific. The 421st moved to Clark Field in the Philippines in March 1946. It was inactivated at Clark Field on 15 June 1946. The squadron's low-hour aircraft were flown to storage depots in the United States.

Cold War

421st Air Refueling Squadron Boeing KB-50J Superfortress 48-0088 in 1960.
421st Air Refueling Squadron Boeing KB-50J Superfortress 48-0088 in 1960.

The 421st Air Refueling Squadron's origins were in an advanced detachment of tankers assigned to the 98th Bombardment Wing, which moved to Yokota Air Base, Japan from Spokane AFB, Washington. Shortly after arrival at Yokota, the Detachment was replaced by the 421st Air Refueling Squadron, which assumed its mission, equipment, and personnel. The mission of the squadron was to provide dedicated air refueling for in-flight refueling capable Far East Air Force (later Pacific Air Forces) bombers, fighters, and fighter bombers. The squadron was initially equipped with transferred Strategic Air Command (SAC) KB-29M Stratofortress bombers that were converted to tankers using a British-developed hose refueling system.

In 1958, the squadron upgraded to Boeing B-50 Superfortress tankers, which provided greater speed to refuel jet aircraft. KB-50s were modified about 1959 to KB-50J configuration which added a J-47 turbojet engine underneath each wing in place of the auxiliary fuel tanks to increase the speed of the aircraft.

Some aircraft and crews deployed to Don Muang Royal Thai Air Force Base, Thailand in 1961 to support USAF advisory tactical jet aircraft. Some of these aircraft ran low on fuel while still over South Vietnam. Some of the refuelings were carried out at such low altitudes that they came under hostile ground fire.

By 1964, the unit possessed almost all of the KB-50s remaining in the Air Force inventory, but its aircraft began to show signs of corrosion and structural fatigue. They were taken out of service in 1965, but it was considered too risky to fly them across the Pacific to storage at the Military Aircraft Storage and Disposition Center at Davis–Monthan AFB, Arizona. The squadron's aircraft were scrapped on their hardstands at Yokota.[4] The squadron inactivated and its mission was assumed by SAC Boeing KC-97 Stratotankers and Boeing KC-135 Stratotankers.


421st Bombardment Squadron

  • Constituted as 421st Bombardment Squadron, Very Heavy on 28 February 1944
Activated on 11 March 1944
Inactivated on 15 June 1946[5]
Consolidated on 19 September 1985 with 421st Air Refueling Squadron as the 421st Air Refueling Squadron[6] (remained inactive)

421st Air Refueling Squadron

  • Constituted ca. 1 July 1953 as 421st Air Refueling Squadron, Medium
Activated on 8 July 1953
Redesignated as 421st Air Refueling Squadron, Fighter-Bomber
Redesignated as 421st Air Refueling Squadron, Tactical on 1 July 1958
Inactivated on 18 February 1965
Consolidated on 19 September 1985 with 421st Bombardment Squadron as the 421st Air Refueling Squadron, Heavy[6] (remained inactive)
  • Redesignated 421st Expeditionary Air Refueling Squadron and converted to provisional status on 12 June 2002[7]




Awards and campaigns

Award streamer Award Dates Notes
Streamer PUC Army.PNG
Distinguished Unit Citation 28 May 1945 421st Bombardment Squadron Yokohama, Japan[1]
Streamer PUC Army.PNG
Distinguished Unit Citation 27 July 1945 – 14 August 1945 421st Bombardment Squadron Japan and Korea[1]
Air Force Outstanding Unit Award Streamer.jpg
Air Force Outstanding Unit Award 1 July 1960 – 31 March 1962 421st Air Refueling Squadron[9]
Air Force Outstanding Unit Award Streamer.jpg
Air Force Outstanding Unit Award 1 November 1962 – 15 March 1964 421st Air Refueling Squadron[9]
Air Force Outstanding Unit Award Streamer.jpg
Air Force Outstanding Unit Award 9 June 1964 – 14 October 1964 421st Air Refueling Squadron[9]
Campaign Streamer Campaign Dates Notes
Streamer APC.PNG
Air Offensive, Japan 421st Bombardment Squadron[1]
Streamer APC.PNG
Eastern Mandates 421st Bombardment Squadron[1]
Streamer APC.PNG
Western Pacific 421st Bombardment Squadron[1]



  1. ^ a b c d e f g h i Maurer, Combat Squadrons, pp. 516–517
  2. ^ "Abstract, Initial History of 504th Bombardment Group, Very Heavy". Air Force History Index. Retrieved 15 August 2013.
  3. ^ a b Maurer, Combat Units, p. 368
  4. ^ Smith, p. 51
  5. ^ a b c d Lineage, assignments, stations and components prior to 1953 are in Maurer, Combat Squadrons, p. 515
  6. ^ a b Department of the Air Force/MPM Letter 662q, 19 Sep 85, Subject: Reconstitution, Redesignation, and Consolidation of Selected Air Force Tactical Squadrons
  7. ^ a b Department of the Air Force/XPM Letter 303s, 12 June 2002, Subject: Air Mobility Command Expeditionary Units
  8. ^ DAF/XPM Letter 303s-3, 19 March 2003, Subject: Air Mobility Command Expeditionary Units
  9. ^ a b c AF Pamphlet 900-2, 15 June 1971, p. 374


 This article incorporates public domain material from the Air Force Historical Research Agency website

External links

This page was last edited on 4 March 2020, at 03:34
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.