BW as part of the Tri-Deputate Organization. Seven B-36Bs were converted to RB-36D. Several RB-36D aircraft temporarily assigned to 91st Strategic Reconnaissance Squadron for duty during Korean War. Reactivation Activated on 1 September 1991 as part of the Air Force's Objective Wing reorganization. Elements periodically deploy to Diego Garcia for Air Expeditionary duty since 11 September 2001. Lineage Established as the 28th Composite Group on 22 December 1939 Activated on 1 February 1940 Redesignated 28th Bombardment Group (Composite) on 11 December 1943 Inactivated on 20 October 1945 Redesignated 28th Bombardment Group, Very Heavy on 15 July 1946 Activated on 4 August 1946 Redesignated: 28th Bombardment Group, Medium on 28 May 1948 Redesignated: 28th Bombardment Group, Heavy on 16 May 1949 Redesignated: 28th Strategic Reconnaissance Group on 1 April 1950 Redesignated: 28th Strategic Reconnaissance Group, Heavy on 16 July 1950 Inactivated on 16 June 1952 Redesignated: 28th Bombardment Group, Heavy on 31 July 1985 (remained inactive) Redesignated: 28th Operations Group on 29 August 1991 Activated on 1 September 1991 Assignments 1st Wing (later 1st Bombardment Wing), 1 February 1940 Alaska Defense Command, 23 February 1941 (attached to Air Field Forces, Alaska Defense Command, 21 May-16 October 1941, Air Force, Alaska Defense Command after 17 October 1941) Alaskan Air Force (later 11th Air Force, Eleventh Air Force), 15 January 1942 (attached to Provisional XI Bomber Command after c. 5 February 1942) XI Bomber Command, 19 March 1943 Eleventh Air Force, 31 March 1944 – 20 October 1945 Fifteenth Air Force, 4 August 1946 (attached to Alaskan Air Command after 20 October 1946) Strategic Air Command, 1 January 1947 (attached to Alaskan Air Command) Alaskan Air Command, 4 February 1947 Fifteenth Air Force, 10 March 1947 28th Bombardment Wing (later 28th Strategic Reconnaissance) Wing), 15 August 1947 – 16 June 1952 (attached to 3d Air Division, 19 July-18 October 1948) 28th Wing (later 28th Bomb Wing), 1 September 1991 – present Components 4th Airborne Command and Control Squadron: 1 September 1991 – 30 September 1992 28th Air Refueling Squadron: 1 September 1991 – 1 June 1992 28th Operations Support Squadron, 1 September 1991 – present 34th Bomb Squadron: 19 September 2002–present 37th Bombardment Squadron (later 37th Bomb Squadron): 1 February 1940 – 23 April 1941; 1 September 1991–present 77th Bombardment Squadron (later 77th Strategic Reconnaissance Squadron, 77th Bomb Squadron): 2 January 1942 – 20 October 1945; 4 August 1946 – 16 June 1952