IIRC there are no F-16 units, active duty, ANG or reserve, that have a pure 100% A2A mission. There are units that have A2A as a priority role and secondary is A2G, which IIRC the 80th FS in the 8th FW (Kunsan AB, Korea) is primarily tasked with A2A with a secondary role of air interdiction, whereas their sister squadron, the 35th, is Air Interdiction and SEAD primarily with A2A as secondary.