Donaldson Air Force Base in Greenville, South Carolina, was closed in 1963. The property was transferred to the City and County of Greenville, South Carolina in 1964. It is currently owned 50/50 by the city and county, with some private industrial ownership of the peripheral areas. Now known as the South Carolina Technology and Aviation Center (SCTAC), the 2,600-acre industrial park that is home to various high-profile companies such as Lockheed Martin, Michelin, IBM, 3M, and others. It is one of six bases in the state that continue to be a problem for toxic military contamination and potential exposure impacts.