In Vietnam, the F100 (successor to F86) was in use, and it was actually obsolete at the time in comparison to the Migs.
The F100 was the first jet that could fly supersonic in level flight. It was known as the widowmaker, as it was basically a subsonic aircraft that could go supersonic, with pre-supersonic cockpit and controls. The workload on the pilots was intense, and many pilots died in flight school.
Since it was basically obsolete, it was used as ground attack aircraft, with fighter support provided by F105s.
The F100 was the first jet that could fly supersonic in level flight. It was known as the widowmaker, as it was basically a subsonic aircraft that could go supersonic, with pre-supersonic cockpit and controls. The workload on the pilots was intense, and many pilots died in flight school.
Since it was basically obsolete, it was used as ground attack aircraft, with fighter support provided by F105s.
Source: family member flew F100s in Vietnam