sentences:  Assumed additional designations of 25th NORAD Region and 25th CONAD Region after activation of the NORAD Combat Operations Center at the Cheyenne Mountain Complex, Colorado and reporting was transferred to NORAD from ADC at Ent Air Force Base in April 1966.Assumed additional designation 25th ADCOM Region on 8 December 1978.The division was a major part of Air Defense Command, and later Aerospace Defense Command (ADCOM) in 1968.