323d Expeditionary Operations Group
The 323d Expeditionary Operations Group is a provisional United States Air Force organization with lineage reaching back to a World War II B-26 Marauder bombardment group.
Last updated October 5, 2026
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Overview
The 323d Expeditionary Operations Group is a provisional United States Air Force unit assigned to United States Air Forces in Europe. Unlike a commercial brand, it is a military organization whose identity is defined by lineage, operational heritage, and the ability to be activated for contingency requirements. The unit was redesignated and converted to provisional status on 25 March 2003, and its provisional character means that it can be activated or inactivated when required. Publicly available reference material does not identify a reported activation after that conversion. The group traces its principal historical lineage to the 323d Bombardment Group, constituted in June 1942 and activated at Columbia Army Air Base, South Carolina, on 4 August 1942. It trained with Martin B-26 Marauder medium bombers and moved to England in spring 1943. Arriving at RAF Horham in May 1943, it later relocated to RAF Earls Colne and began medium-altitude bombing operations in July. Its World War II missions included attacks on marshalling yards, airfields, industrial facilities, military installations, coastal defenses, and other targets in France, Belgium, the Netherlands, and Germany. The group initially served under the Eighth Air Force and later transferred with other Marauder formations to the Ninth Air Force. It supported the Allied air campaign against German aircraft production and weapons sites, including V-1 and V-2 installations. In 1944 it helped prepare for and support the Normandy invasion, attacked targets connected with the breakout from Saint-Lô, conducted night attacks on fuel and ammunition stores, and supported operations around Brest and the Siegfried Line. During the Battle of the Bulge, its attacks on transportation targets helped restrict the movement of German reinforcements toward the Ardennes. For this service it received a Distinguished Unit Citation. The group ended the war in Germany, participated in disarmament-related activity after victory in Europe, returned to the United States, and was inactivated on 12 December 1945. The lineage continued in the Air Force Reserve when the group was activated at Tinker Air Force Base, Oklahoma, in September 1947. It operated Douglas A-26 Invader aircraft and was later assigned to the 323d Bombardment Wing. The group was ordered to active duty during the Korean War on 10 March 1951, but its personnel were used as fillers for other units and the group was inactivated on 17 March 1951. In 1955 the organization returned as the 323d Fighter-Bomber Group at Bunker Hill Air Force Base, Indiana. It trained first with North American F-86F Sabres, then F-86H aircraft, and subsequently North American F-100 Super Sabres. This phase ended with inactivation on 1 September 1957. The group was reactivated again in 1991 as the 323d Operations Group at Mather Air Force Base, California, within the 323d Flying Training Wing. Its principal role was navigator training. Base closure under the Base Realignment and Closure process led to the gradual inactivation of subordinate flying-training units, followed by the group's inactivation on 31 May 1993. Its mission and much of its Boeing T-43 fleet transferred to the 12th Operations Group at Randolph Air Force Base, Texas. The current provisional designation preserves the 323d's historical identity while providing a framework for possible expeditionary operations.
History
The organization's lineage began during the buildup of American air power in World War II. Constituted as the 323d Bombardment Group (Medium) on 19 June 1942, it was activated at Columbia Army Air Base, South Carolina, on 4 August. Its initial components were the 453d, 454th, 455th, and 456th Bombardment Squadrons. The group trained in the southeastern United States under Third Air Force with Martin B-26 Marauders. Its aircrews and ground personnel then moved to the European Theater in separate echelons: aircraft traveled by ferry routes, while the ground echelon crossed the Atlantic aboard the RMS Queen Elizabeth. The group reached RAF Horham in Suffolk on 12 May 1943 and was assigned to the Eighth Air Force. In June it moved to RAF Earls Colne, bringing it closer to the planned tactical air war over continental Europe. On 16 July 1943 it flew what reference histories describe as the first medium-altitude missions by Eighth Air Force medium bombers. During this period it attacked transportation centers, airfields, industrial sites, and military facilities in occupied Western Europe. In October 1943 the group transferred to the Ninth Air Force, which was reorganizing its tactical resources for operations from Britain and, later, the Continent. The 323d supported the Allied air offensive during the winter of 1943–44, including attacks on V-1 and V-2 sites and airfields at Leeuwarden and Venlo during the campaign against the Luftwaffe and German aircraft production. In preparation for Operation Overlord, it bombed coastal defenses, rail yards, and airfields. On D-Day, 6 June 1944, it attacked roads and coastal batteries in support of the Normandy landings. It moved to RAF Beaulieu in July to extend its reach over western France and supported Operation Cobra, the Allied breakout from the Saint-Lô area. It also undertook night attacks against fuel and ammunition dumps. The group moved to Lessay Airfield in Normandy in August 1944 and supported operations against German positions at Brest and along the advance toward the Siegfried Line. During the Battle of the Bulge, its interdiction missions targeted rail and road transportation to obstruct the movement of German reinforcements into the Ardennes. This performance earned the group a Distinguished Unit Citation. In the final months of the European war, it attacked targets in the Ruhr and ended the campaign at Gablingen in Germany. After VE Day it took part in disarmament activity, returned to the United States in December 1945, and was inactivated at the port of embarkation on 12 December. The group was reactivated in the Air Force Reserve at Tinker Air Force Base on 9 September 1947, equipped with Douglas A-26 Invader light bombers. It became associated with the 323d Bombardment Wing after the Air Force Reserve adopted the wing-base structure. Mobilized during the Korean War on 10 March 1951, the group was not deployed as an intact formation; its personnel were redistributed to bring other units to authorized strength. It was consequently inactivated on 17 March 1951. On 8 August 1955 the unit was activated at Bunker Hill Air Force Base as the 323d Fighter-Bomber Group. Its aircraft progression included the F-86F and F-86H Sabre, followed by the F-100 Super Sabre. The group was inactivated on 1 September 1957 when the base transferred to Strategic Air Command. The lineage was revived in the training mission when the 323d Operations Group was activated at Mather Air Force Base on 1 September 1991, becoming part of the 323d Flying Training Wing under the Objective Wing structure. The group trained navigators and operated in an organization that included flying-training squadrons and an operations support squadron. Mather's scheduled closure under Base Realignment and Closure resulted in the inactivation of subordinate units during 1992 and of the group on 31 May 1993. The navigator-training mission and much of the Boeing T-43 inventory were reassigned to the 12th Operations Group at Randolph Air Force Base. On 25 March 2003, the 323d Operations Group was redesignated the 323d Expeditionary Operations Group and converted to provisional status. The designation placed it under United States Air Forces in Europe and made it available for activation when expeditionary or contingency requirements arise. Because provisional units are not continuously active in the same manner as standing operational groups, the public record does not establish a current active station, commander, aircraft inventory, or a reported post-2003 activation.
- 2003
Conversion to provisional expeditionary status
[1]On 25 March the unit was redesignated the 323d Expeditionary Operations Group and assigned to United States Air Forces in Europe as a provisional organization.
- 1993
Mather-era inactivation
[1]The group was inactivated on 31 May after the closure of Mather Air Force Base and transfer of its training mission to Randolph.
- 1991
Navigator-training operations
[1]The 323d Operations Group was activated at Mather Air Force Base within the 323d Flying Training Wing to conduct navigator training.
- 1955
Fighter-bomber reactivation
[1]The organization was reactivated as the 323d Fighter-Bomber Group at Bunker Hill Air Force Base and transitioned from F-86 Sabres to F-100 Super Sabres.
- 1951
Korean War mobilization
[1]The group was ordered to active duty on 10 March, but its personnel were redistributed to other units before inactivation on 17 March.
- 1947
Air Force Reserve activation
[1]The group returned as an Air Force Reserve unit at Tinker Air Force Base, operating Douglas A-26 Invaders.
- 1945
World War II inactivation
[1]After returning to the United States from the European Theater, the group was inactivated on 12 December.
- 1944
Normandy and continental operations
[1]The group supported the Normandy invasion, Operation Cobra, attacks around Brest, and the Allied advance toward Germany.
- 1944
Distinguished Unit Citation
[1]The group received a Distinguished Unit Citation for transportation interdiction during the Battle of the Bulge.
- 1943
Arrival in the European Theater
[1]The group arrived at RAF Horham in May, moved to RAF Earls Colne, and began medium-altitude bombing operations in July.
Products and positioning
A provisional United States Air Force expeditionary organization defined by inherited combat lineage, operational readiness, and activation for contingency missions rather than by commercial products or services.
medium bomber · 1942
Martin B-26 Marauder
The B-26 Marauder was the principal aircraft of the group's World War II bombardment phase. The 323d used it for medium-altitude attacks against transportation networks, airfields, industrial facilities, coastal defenses, and other targets across occupied Western Europe and Germany.
light bomber · 1947
Douglas A-26 Invader
The Air Force Reserve incarnation of the group trained with the Douglas A-26 Invader after its 1947 activation at Tinker Air Force Base. The aircraft represented the unit's postwar reserve light-bombardment role before its Korean War mobilization.
fighter-bomber · 1955
North American F-86 Sabre
During its 1955–1957 fighter-bomber period, the group initially operated North American F-86F Sabres and then upgraded to F-86H aircraft for tactical fighter-bomber training.
supersonic fighter-bomber · 1955
North American F-100 Super Sabre
The F-100 Super Sabre became the later aircraft type associated with the group's Bunker Hill fighter-bomber phase before the organization was inactivated in 1957.
navigator-training aircraft · 1991
Boeing T-43
The 323d Operations Group used Boeing T-43 aircraft in its navigator-training role at Mather Air Force Base. Much of the aircraft inventory and the associated mission transferred to the 12th Operations Group after Mather's closure.
Marketing campaigns
- 1944Operation Overlord
Normandy · France
The group attacked coastal defenses, transportation targets, airfields, roads, and coastal batteries in preparation for and support of the Normandy invasion.
Outcome. Supported the Allied landings and subsequent operations in northern France.
- 1944Operation Cobra
Saint-Lô · France
The group supported the Allied breakout from the Saint-Lô area and conducted night attacks against fuel and ammunition dumps.
Outcome. Contributed air support to the Allied advance across France.
- 1944Battle of the Bulge interdiction
Ardennes · Belgium
The group targeted transportation routes and related infrastructure to slow German reinforcement movements toward the Ardennes.
Outcome. The group's performance was recognized with a Distinguished Unit Citation.
- 1943European strategic and tactical bombing operations
France · Belgium · Netherlands
The group conducted medium-altitude bombing missions against rail yards, airfields, industrial sites, and military installations after arriving in England.
Outcome. Established the group's operational role in the European Theater and supported the Allied air campaign.
Brand decisions
2003
Conversion to provisional expeditionary statusStrategyBackground
The Air Force maintained the 323d lineage while creating a unit that could be made available for contingency requirements in the European theater.
Action taken
The 323d Operations Group was redesignated the 323d Expeditionary Operations Group and converted to provisional status on 25 March.
Aftermath
The unit became activatable or inactivatable as needed. No publicly reported activation is identified in the supplied reference.
Sources1 sources
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