sentences:  Beginning on 1 January 1958, it the command organization for the Seattle Air Defense Sector Semi Automatic Ground Environment (SAGE) Data Center (DC-12) at McChord.A few months later, on 1 September, the Portland Air Defense Sector, with its SAGE Direction Center (DC-13) at Adair Air Force Station, Oregon also came under the 25th AD; on 8 September the Spokane Air Defense Sector and DC-15 at Larson Air Force Base toned the 25th AD.In 1959, the Reno Air Defense Sector and DC-16 at Stead Air Force Base, Nevada was also incorporated.