On 22 July 1968, the 391st Tactical Fighter Squadron's direct involvement in the Vietnam conflict drew close with its reassignment to the 475th Tactical Fighter Wing at Misawa Air Base, Japan. Here the squadron mission changed to providing air defense to Japan. In addition, the 391st provided air defense to Korea through numerous deployments to Taegu Air Base and Kunsan Air Base in South Korea. This continued for almost three years, until the 1 July 1971 assignment of the squadron to the 347th Tactical Fighter Wing at Mountain Home Air Force Base, Idaho. This move took place without personnel or equipment, with the 391st Tactical Fighter Squadron designation moving to a squadron of F-111F aircraft at Mountain Home. The 366th Tactical Fighter Wing replaced the 347th Tactical Fighter Wing at Mountain Home on 31 October 1972, reuniting the 391st Tactical Fighter Squadron with its previous parent unit.
Squadron operations throughout the 1970s and 1980s centered on maintain combat capability and training F-111 aircrew. In 1977 Operation READY SWITCH brought a change in aircraft, with the F-111F fleet replaced by the older F-111A aircraft. After the conversion, the mission of the squadron remained relatively unchanged with the F-111 training and combat preparations continuing throughout the 1980s into 1990. The 391st Tactical Fighter Squadron ended its F-111A mission on 1 July 1990, with the squadron inactivated when the Air Force began to retire the F-111A fleet.
With the 366th Tactical Fighter Wing re-designated as the 366th Wing in preparation for a change to a composite force structure, the 391st once again became activated as a component of the wing. When activated on 11 March 1992, the squadron was re-designated as the 391st Fighter Squadron and equipped with the F-15E Strike Eagle, serving as a dual-role asset to the Air Force's first Air Intervention Composite Wing.
391st FS's Top-Scoring Deployment Pilot
Lt Col BIC 
| Total Time (Rounded) | Night Time (Rounded) | Airfield/FARP Landings | Inst. Approaches | 10 | 2 | 9 | 2 |
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