| United States|
| United States Army Air Forces|
The 820th Bombardment Squadron is an inactive United States Air Force unit. Its last assignment was with the 41st Bombardment Group, based at Fort Lawton, Washington. It was inactivated on 4 January 1946.
820th Bombardment Squadron Wikipedia
Formed in late 1942 and equipped with Lockheed Ventura antisubmarine patrol aircraft. Assigned to Third Air Force and performed antisubmarine patrols over the Southeast Atlantic coast until July 1943.
Realigned as a B-25 Mitchell medium bomber squadron after the Navy took over the antisubmarine mission. Trained under Third Air Force, then deployed to California before being deployed to Seventh Air Force. Completed final training in Hawaii and moved to Tarawa in the Central Pacific in December 1943. Entered combat and attacked enemy installations, airfields, and shipping in the Marshall Islands in preparation for the invasion by US forces, and after February 1944 staged through captured fields on Eniwetok to attack shipping in the Caroline Islands.
In April 1944 moved to Makin where its missions were directed primarily against shipping and bypassed islands in the Marshalls and Carolines. Returned to Hawaii in October 1944 for training with rockets and new B-25's. Moved to Okinawa, May–June 1945. Bombed airfields, railways, and harbor facilities on Kyushu until August 1945. Also flew some missions against airfields in China.
Moved to Manila in December 1945. Inactivated in the Philippines on January 27, 1946.Constituted 521st Bombardment Squadron (Heavy) on 13 October 1942
Activated on 18 October 1942
Redesignated: 16th Antisubmarine Squadron (Heavy)
on 29 November 1942
Redesignated: 820th Bombardment Squadron (Medium)
on 22 September 1943
Inactivated on 4 January 1946.
378th Bombardment Group, 18 October 1942
25th Antisubmarine Wing, 14 December 1942
41st Bombardment Group, 11 October 1943 – 4 January 1946.
Charleston AAF, South Carolina, 18 October 1942
Hammer Field, California, 22 September-5 October 1943
Hickam Field, Territory of Hawaii, October 20, 1943
Hawkins Field, Tarawa, Gilbert Islands, 24 December 1943
Makin Airfield, Makin, Gilbert Islands, April 21, 1944
Wheeler Field, Territory of Hawaii, 14 October 1944
Yontan Airfield, Okinawa, June 7, 1945
Fort Lawton, Washington, 1–4 January 1946
Douglas O-46, 1942
Lockheed Ventura, 1942–1943
B-25 Mitchell, 1943-1945.