In 1981 at the end of its service life, the F-105s were retired, with the 113th TFW receiving F-4D Phantom IIs, again receiving Vietnam War veteran aircraft from active-duty units receiving F-15A and F-16A/B next-generation fighter aircraft. With the F-4, the 113th returned to the air defense mission, becoming part of Air Defense, Tactical Air Command (ADTAC), a named unit at the Numbered Air Force echelon of TAC. ADTAC had taken over the mission of Aerospace Defense Command in 1979 when the command was inactivated; the D.C. Air National Guard using the Phantoms for Washington, D.C. air defense.