With the disestablishment of Aerospace Defense Command in 1979, the 158th was subsequently transferred to Tactical Air Command (TAC) as a gaining command under Air Defense, Tactical Air Command (ADTAC), which assumed the mission of the former ADC.

In 1980, the 158th began a transition to the F-4D Phantom II, a powerful, two seat, twin-engine fighter, with the Vermont Air National Guard, leaving the Air Defense community to become part of main line Tactical Air Command with a primary mission of ground attack and close air support.

The 158th Tactical Fighter Group deployed to the Gulfport Combat Readiness Training Center, Mississippi, in January 1983 to prepare for the upcoming Operational Readiness Inspection.
This was the unit's first large-scale deployment in 23 years.
The last deployment had been for summer camp at Otis AFB, Massachusetts, in 1960.

The 158th Civil Engineering Squadron dedicated its new building on 14 December.
Fifty-two members of the CE Squadron deployed to Panama on a humanitarian mission in January 1994.
They constructed a six-room masonry block school building and a single story wood frame building to be used as a hospice by the local hospital.

In the mid eighties the USAF decided to re-equip the Air National Guard units with more modern equipment as part of the "Total Force" concept.
In the earlier decades the ANG always had to be thankful to receive older USAF jets.
With the introduction of the F-16 this changed.
 The F-4D Phantoms were retired in 1986 and the first F-16 Fighting Falcon models of the 134th FS were of the block 15 version – although also some earlier 1970s block 1 and 10 models were flown for a brief time.
These aircraft came from regular USAF squadrons who transitioned to newer F-16C/D models, but still these aircraft, largely 1982 models, were no older than a mere 5 years.

From 1989–1997, the 134th Fighter Squadron's mission was air defense, having aircraft on 5-minute alert, seven days a week, 24 hours a day.
Locations of these alert aircraft included Burlington, Maine, Virginia and South Carolina.
 The location of the Vermont ANG was much more specific in their relation to NORAD that they were tasked with this defense as a primary role.
Therefore, the block 15 lacked the Beyond Visual Range capability.
However, this changed in the course of 1990 with the upgrade of their aircraft to the block 15 ADF (Air Defense Fighter) version.
This meant a serious leap in performance and capability of this squadron in their defensive role.
As a result, the Vermont ANG has one of the highest rates of interceptions of Russian bombers that were coming in over the North Pole, except for some Alaskan USAF units.

Many times Vermont F-16's were called upon to fly to a point just short of Iceland and escort Soviet bombers as they flew off the coastline of the United States.
The 158th FW has also assisted with aircraft experiencing in-flight malfunctions and hijackings.
With the disestablishment of Aerospace Defense Command in 1979, the 158th was subsequently transferred to Tactical Air Command (TAC) as a gaining command under Air Defense, Tactical Air Command (ADTAC), which assumed the mission of the former ADC.
In 1980, the 158th began a transition to the F-4D Phantom II, a powerful, two seat, twin-engine fighter, with the Vermont Air National Guard, leaving the Air Defense community to become part of main line Tactical Air Command with a primary mission of ground attack and close air support.
The 158th Tactical Fighter Group deployed to the Gulfport Combat Readiness Training Center, Mississippi, in January 1983 to prepare for the upcoming Operational Readiness Inspection. This was the unit's first large-scale deployment in 23 years. The last deployment had been for summer camp at Otis AFB, Massachusetts, in 1960.
The 158th Civil Engineering Squadron dedicated its new building on 14 December. Fifty-two members of the CE Squadron deployed to Panama on a humanitarian mission in January 1994. They constructed a six-room masonry block school building and a single story wood frame building to be used as a hospice by the local hospital.
In the mid eighties the USAF decided to re-equip the Air National Guard units with more modern equipment as part of the "Total Force" concept. In the earlier decades the ANG always had to be thankful to receive older USAF jets. With the introduction of the F-16 this changed.  The F-4D Phantoms were retired in 1986 and the first F-16 Fighting Falcon models of the 134th FS were of the block 15 version – although also some earlier 1970s block 1 and 10 models were flown for a brief time. These aircraft came from regular USAF squadrons who transitioned to newer F-16C/D models, but still these aircraft, largely 1982 models, were no older than a mere 5 years.
From 1989–1997, the 134th Fighter Squadron's mission was air defense, having aircraft on 5-minute alert, seven days a week, 24 hours a day. Locations of these alert aircraft included Burlington, Maine, Virginia and South Carolina.  The location of the Vermont ANG was much more specific in their relation to NORAD that they were tasked with this defense as a primary role. Therefore, the block 15 lacked the Beyond Visual Range capability. However, this changed in the course of 1990 with the upgrade of their aircraft to the block 15 ADF (Air Defense Fighter) version. This meant a serious leap in performance and capability of this squadron in their defensive role. As a result, the Vermont ANG has one of the highest rates of interceptions of Russian bombers that were coming in over the North Pole, except for some Alaskan USAF units.
Many times Vermont F-16's were called upon to fly to a point just short of Iceland and escort Soviet bombers as they flew off the coastline of the United States. The 158th FW has also assisted with aircraft experiencing in-flight malfunctions and hijackings.
134th Fighter Squadron