World War I

The first predecessor of the squadron was organized as the 79th Aero Squadron at Kelly Field, Texas in August 1917. It deployed to the Aviation Concentration Center in Garden City, New York in November for shipment to France. It arrived in France the following month and moved to Saint-Nazaire, where it was redesignated the 491st Aero Squadron (Construction) and constructed and maintained facilities from February until December 1918. It returned to the United States in January 1919 and was demobilized. It was reconstituted c. 16 October 1936 and consolidated with the 491st Bombardment Squadron.

Organized Reserves between World War I and World War II

The 492d Bombardment Squadron was authorized in the Organized Reserves in March 1924. It was activated at Sand Point Airport, Washington in the Ninth Corps Area the following January and assigned to the 349th Bombardment Group. The squadron was only nominally manned before it was inactivated in the spring of 1937. Along with all other United States Army Air Corps Organized Reserve units, it was disbanded in May 1942. In August 1958 it was reconstituted and consolidated with the 492d Bombardment Squadron, Medium.

World War II

The 491st Bombardment Squadron (Medium) was activated in September 1942 as a North American B-25 Mitchell bomber squadron at Karachi, India. It was assigned to the newly activated 341st Bombardment Group of Tenth Air Force. The squadron did not receive a full complement of aircraft and personnel until the end of the year. After moving to Chakulia Airfield, the squadron began combat operations, flying its first mission on 10 January 1943. For the remainder of the year the squadron was primarily tasked with interdicting Japanese lines of communication in Burma.

The squadron was transferred to Fourteenth Air Force and moved to China in January 1944. Again the squadron's primary tasking was interdiction of Japanese lines of communication in China and eastern French Indochina (now Vietnam). In addition to strikes against airfields, bivouac and storage areas and bridges, the unit performed target of opportunity sweeps along roads, rivers and over the Gulf of Tonkin and the South China Sea.

When Japan surrendered, sixteen squadron aircrews and several aircraft maintenance personnel were in India undergoing transition training to Douglas A-26 Invader. About 31 August 1945 the remaining 491st personnel joined those in India. Those determined to meet rotation requirements embarked on a transport ship and returned to the United States, arriving on 1 November. The squadron was inactivated at Camp Kilmer, New Jersey on 2 November 1945.

Cold War

The unit was redesignated 491st Bombardment Squadron, Light on 26 May 1947 and activated in the reserve on 5 June. The squadron was inactivated on 27 June 1949 when Continental Air Command reorganized its operational reserve units under the wing base organizational model.

The squadron was redesignated 491st Bombardment Squadron, Medium on 20 August 1958 and consolidated with the 491st Bombardment Squadron. It was activated on 1 November and assigned to the 341st Bombardment Wing at Dyess Air Force Base operating the Boeing B-47 Stratojet. In March 1961, President John F. Kennedy directed that the phaseout of the B-47 be accelerated. The squadron was inactivated on 25 June 1961 as part of that draw down, and its aircraft were sent to storage at Davis–Monthan Air Force Base, Arizona.

Assignments

• Unknown, 15 August–December 1917
• Seventh Aviation Instruction Center, December 1917 – December 1918
• Unknown, December 1918 – 31 January 1919
• 349th Bombardment Group, January 1925 – 2 March 1937^[3]
• 341st Bombardment Group, 15 September 1942 – 2 November 1945
• 341st Bombardment Group, 5 June 1947 – 27 June 1949
• 341st Bombardment Wing, 1 November 1958 – 25 June 1961.
• 49 Operations Group, 15 April 2019 – present^[5]

Stations

Aircraft

• North American B-25 Mitchell, 1942–1945
• Douglas A-26 Invader, 1945
• Boeing B-47 Stratojet, 1958–1961^[4]

Notes

Explanatory notes

Citations

Bibliography

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

• Cantwell, Gerald T. (1997). Citizen Airmen: a History of the Air Force Reserve, 1946-1994 (PDF). Washington, D.C.: Air Force History and Museums Program. ISBN 0-16049-269-6. Retrieved 17 December 2016.
• Clay, Steven E. (2011). US Army Order of Battle 1919-1941 (PDF). Vol. 3 The Services: Air Service, Engineers, and Special Troops 1919-1941. Fort Leavenworth, KS: Combat Studies Institute Press. ISBN 978-0-98419-014-0. LCCN 2010022326. OCLC 637712205. Archived from the original (PDF) on 27 September 2013. Retrieved 16 October 2012.
• Knaack, Marcelle Size (1978). Encyclopedia of US Air Force Aircraft and Missile Systems (PDF). Vol. 2, Post-World War II Bombers 1945-1973. Washington, DC: Office of Air Force History. ISBN 0-912799-59-5. Retrieved 17 December 2016.
• Maurer, Maurer, ed. (1983) [1961]. Air Force Combat Units of World War II (PDF) (reprint ed.). Washington, DC: Office of Air Force History. ISBN 0-912799-02-1. LCCN 61060979. Retrieved 17 December 2016.
• Maurer, Maurer, ed. (1982) [1969]. Combat Squadrons of the Air Force, World War II (PDF) (reprint ed.). Washington, DC: Office of Air Force History. ISBN 0-405-12194-6. LCCN 70605402. OCLC 72556.
• Ravenstein, Charles A. (1984). Air Force Combat Wings, Lineage & Honors Histories 1947-1977 (PDF). Washington, DC: Office of Air Force History. ISBN 0-912799-12-9. Retrieved 17 December 2016.
• Official History Summaries of 491st Bombardment Squadron (M), on file, Air Force Historical Research Agency, Maxwell AFB, Alabama.