The Alternate Processing and Correlation Center (APCC) in the USSTRATCOM Underground Command Complex at Offutt AFB provides an alternate missile warning correlation center to the Cheyenne Mountain Missile Warning Center. It is the prime source of missile warning data for USSTRATCOM for force survival and force management. The facility consists of the integration of the SCIS, CSSR, and CCPDS-R systems and also upgrade equipment and communications links.[1]
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Alternate Processing and Correlation Center Wikipedia(Text) CC BY-SA