 The former Myrtle Beach A-7D's continued service in the Air National Guard until the late 1980s, with the last at Rickenbacker ANGB (Ohio), Des Moines (Iowa), Tulsa (Oklahoma) and Springfield (Ohio) being replaced by the F-16 by mid-1993.By the end of 1998, all were disposed of by AMARC.On 22 March 1975, an agreement was made for joint civilian-military aviation activities at the base.