The group was organized as an operational unit at Roswell Army Air Field, New Mexico on 16 August 1947, where it again equipped with Mustangs and became part of Eighth Air Force of Strategic Air Command.
At Roswell, the group participated in the experimental Wing Base organization, which was intended to unify control at air bases under a single wing.
As a result, the group was assigned to the 33d Fighter Wing.
The test proved successful, and the wing-base plan was adopted by the Air Force.

A year later, in June 1948, it received its first jet aircraft, the Republic F-84 Thunderjet.
The group was the second in the Air Force to fly the F-84C model of the Thunderjet.
A few months later the group moved to Otis Air Force Base, Massachusetts, where it assumed an air defense role, first under Continental Air Command, then under Air Defense Command (ADC) as the 33d Fighter-Interceptor Group.

There it trained to maintain tactical proficiency and participated in exercises and aerial demonstrations.
In February 1949, the group transitioned to North American F-86A Sabres.
By December the group had completed its transition to Sabres and assumed an air defense mission, providing air defense in the northeastern US.
Toward the end of 1949, ADC was inactivated and the group and its parent wing became elements of Continental Air Command.
In December 1950 ADC was reactivated, and the group, which since spring had been designated as the 33d Fighter-Interceptor Group rejoined the command.
Because of ADC's need to expand its coverage, the group dispersed the 60th Fighter-Interceptor Squadron to Westover Air Force Base, Massachusetts in August 1950.
The group was inactivated in February 1952 along with the 33d Fighter Wing in a major reorganization of ADC responding to ADC's difficulty under the existing wing base organizational structure in deploying fighter squadrons to best advantage.
Fighter-interceptor groups and wings were replaced by regionally organized air defense wings.

The 564th Air Base Group was activated on 1 February 1952 to replace the support elements of the 33d Fighter-Interceptor Wing.
The group became the 564th Air Defense Group in February 1953 when it assumed control of fighter-interceptor squadrons at Otis.
The unit was replaced by the reactivated 33d Fighter Group (Air Defense) as part of ADC's "Project Arrow", which reactivated fighter units that had achieved distinction in the two world wars.

The 33d Fighter Group was assigned to ADC's 4707th Air Defense Wing, and in 1956 reunited with the 33d Fighter Wing (Air Defense).
Again, it provided air defense in northeastern US flying the Northrop F-89 Scorpion.
It was also the host organization for USAF units until 1956, and was assigned several support organizations to fulfill this function.
when the 33d Fighter Wing was activated and the group was assigned to it once again, along with the support units assigned to the group.
The group was inactivated on 18 August 1957 and replaced by 4735th Air Defense Group when the 551st Airborne Early Warning and Control Wing assumed host responsibilities for Otis from the 33d Fighter-Interceptor Wing.
The group was organized as an operational unit at Roswell Army Air Field, New Mexico on 16 August 1947, where it again equipped with Mustangs and became part of Eighth Air Force of Strategic Air Command. At Roswell, the group participated in the experimental Wing Base organization, which was intended to unify control at air bases under a single wing. As a result, the group was assigned to the 33d Fighter Wing. The test proved successful, and the wing-base plan was adopted by the Air Force.
A year later, in June 1948, it received its first jet aircraft, the Republic F-84 Thunderjet. The group was the second in the Air Force to fly the F-84C model of the Thunderjet. A few months later the group moved to Otis Air Force Base, Massachusetts, where it assumed an air defense role, first under Continental Air Command, then under Air Defense Command (ADC) as the 33d Fighter-Interceptor Group.
There it trained to maintain tactical proficiency and participated in exercises and aerial demonstrations. In February 1949, the group transitioned to North American F-86A Sabres. By December the group had completed its transition to Sabres and assumed an air defense mission, providing air defense in the northeastern US. Toward the end of 1949, ADC was inactivated and the group and its parent wing became elements of Continental Air Command. In December 1950 ADC was reactivated, and the group, which since spring had been designated as the 33d Fighter-Interceptor Group rejoined the command. Because of ADC's need to expand its coverage, the group dispersed the 60th Fighter-Interceptor Squadron to Westover Air Force Base, Massachusetts in August 1950. The group was inactivated in February 1952 along with the 33d Fighter Wing in a major reorganization of ADC responding to ADC's difficulty under the existing wing base organizational structure in deploying fighter squadrons to best advantage. Fighter-interceptor groups and wings were replaced by regionally organized air defense wings.
The 564th Air Base Group was activated on 1 February 1952 to replace the support elements of the 33d Fighter-Interceptor Wing. The group became the 564th Air Defense Group in February 1953 when it assumed control of fighter-interceptor squadrons at Otis. The unit was replaced by the reactivated 33d Fighter Group (Air Defense) as part of ADC's "Project Arrow", which reactivated fighter units that had achieved distinction in the two world wars.
The 33d Fighter Group was assigned to ADC's 4707th Air Defense Wing, and in 1956 reunited with the 33d Fighter Wing (Air Defense). Again, it provided air defense in northeastern US flying the Northrop F-89 Scorpion. It was also the host organization for USAF units until 1956, and was assigned several support organizations to fulfill this function. when the 33d Fighter Wing was activated and the group was assigned to it once again, along with the support units assigned to the group. The group was inactivated on 18 August 1957 and replaced by 4735th Air Defense Group when the 551st Airborne Early Warning and Control Wing assumed host responsibilities for Otis from the 33d Fighter-Interceptor Wing.
33rd Operations Group