The F-104 was designed as an interceptor...
although it could do some light air-to-mud as well. It really wasn't used very much by the USAF. There were some F-104s that served for a time in Vietnam but it appears their service was pretty limited, the same as the F-102.
From the Air Force Museum website
Here's a little more info on the F-104's Vietnam service. It flew several thousand sorties over 21 months before being replaced by the F-4.
