The Full Wiki

504th Bombardment Group: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


From Wikipedia, the free encyclopedia

504th Bombardment Group
504th Bombardment Group Insignia
Active 1944–1946
Country United States
Branch United States Army Air Forces
Role Bombardment
Part of Twentieth Air Force
Garrison/HQ Pacific Ocean Theater of World War II
World War II Victory Medal ribbon.svg Asiatic-Pacific Campaign ribbon.svg
  • World War II
Asiatic-Pacific Campaign

The 504th Bombardment Group (504th BG) was a World War II United States Army Air Forces combat organization. It was inactivated on June 15, 1946.

The unit served primarily in the Pacific Ocean theater of World War II as part of Twentieth Air Force. The 504th Bomb Group's aircraft engaged in B-29 Superfortress bombardment operations against Japan. It's aircraft were identified by a "E" inside a Circle painted on the tail.

The 504th Bombardment Group flew the last combat mission by the United States Army Air Forces of World War II, its last combat mission being on August 15, 1945.





  • Constituted as 504th Bombardment Group (Very Heavy) on 18 Feb 1944
Activated on 11 Mar 1944
Inactivated on 15 Jun 1946


Attached to 17th Bombardment Operational Training Wing (Very Heavy), 12 Mar-5 Nov 1944


  • 393d Bombardment Squadron: 12 Mar-5 Nov 1944
  • 398th Bombardment Squadron: 12 Mar 1944-15 Jun 1946
  • 421st Bombardment Squadron: 12 Mar 1944-15 Jun 1946
  • 507th Bombardment Squadron: 12 Mar-5 Nov 1944
  • 680th Bombardment Squadron: 12 Mar 1944-15 Jun 1946




The group was initially equipped with B-17 Flying Fortresses due to a lack of B-29 Superfortress aircraft. The unit was then reassigned for advanced training and received B-29s at Fairmont AAF, Nebraska during the late spring and summer of 1944. While in training status, the 504th was reduced to two squadrons instead of the normal three allocated to B-29 groups. One of the original squadrons, the 393rd, was transferred out for a highly classified mission. It became the nucleus of the 509th Composite Group, the only military unit in history to drop a Atomic Bomb in combat.

After training, the unit was reassigned to the South West Pacific theatre in late in 1944 for service with the Twentieth Air Force. The 504th was assigned to the 313th Bombardment Wing on Tinian. The group began combat operations from Tinian in January 1945 with attacks on Japanese airfields and other installations on Maug and Iwo Jima and in the Truk Islands. Flew its first mission against the Japanese home islands early in February 1945 when the group bombed the industrial area of Kobe. Continued to attack strategic targets in Japan, operating in daylight and at high altitude to bomb such objectives as aircraft factories, chemical plants, harbors, and arsenals.

Received a Distinguished Unit Citation (DUC) for striking the industrial center at Yokohama late in May 1945. Began incendiary raids in March 1945, flying at night and at low altitude to strike area targets in Japan. Started mining operations against enemy shipping late in Mar, receiving a 2d DUC for mining Korean shipping lanes, the Shimonoseki Strait, and harbors of the Inland Sea, July–August 1945. In April and May 1945 the group hit airfields from which the Japanese launched kamikaze planes against the invasion force during the assault on Okinawa. During mid June 1945 the 680th Bomb Squadron joined the 504th bomb group bring them up to full strength of 3 squardons.

After the war it dropped food and supplies to Allied prisoners, participated in show-of-force missions, and flew over Japan to evaluate damage inflicted by bombardment operations. Moved to the Philippines in March 1946. Inactivated at Clark Field on Luzon on June 15, 1946.


PD-icon.svg This article incorporates public domain material from websites or documents of the Air Force Historical Research Agency.

  • Maurer, Maurer (1983). Air Force Combat Units Of World War II. Maxwell AFB, Alabama: Office of Air Force History. ISBN 0892010924.

External links


Got something to say? Make a comment.
Your name
Your email address