Along with its assignment under SWC, Kirtland AFB received a related air defense mission for Air Defense Command (ADC). Kirtland housed an ADC Air Defense Detection Center (ADDC) which would then alert the Fighter-Interceptor squadrons and the Air Defense Control Center (ADCC) for unknown aircraft intrusions in ADC monitored airspace. The ADCC would then alert ADC's Central Air Defense Force, which consisted of the Western Air Defense Force the Central Air Defense Force [CADF, and the Eastern Air Defense Force . Kirtland hosted one of the first ADCCs in the country, which was under construction at Kirtland in late 1950 and operational before the close of 1951 as part of the 34th Air Division (Defense). ADCCs were innovative buildings that were proto-hardened and designed for protection from atomic, biological, and chemical warfare. A single ADCC controlled multiple FISs for its air defense jurisdiction. Along with the ADCC at KAFB was a corresponding ADDC.