Granite Sentry was a Cheyenne Mountain nuclear bunker improvement program "to provide a Message Processing Subsystem and a Video Distribution Subsystem, and [to upgrade] the NORAD Computer System display capability and four major centers: (1) the Air Defense Operations Center, (2) the NORAD Command Center, (3) the Battle Staff Support Center, and (4) the Weather Support Unit." Granite Sentry was also to process and display "nuclear detection data provided from the Integrated Correlation and Display System." For $230 million the program was also to "replace display screens of the Attack Warning and Attack Assessment System", and Granite Sentry was delayed from 1993 to 1996. Granite Sentry and other Cheyenne Mountain Upgrade interfaces were tested in 1997, and Granite Sentry's processing regarding "simulated [nuclear] detonation messages…injected into the Defense Support Program Data Distribution Center [was] not adequate...".
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|url=value (help). Defense Daily. May 4, 1993. Retrieved 2012-09-18.
CTA, Inc., Rockville, Md., $19 million (Estimated) indefinite delivery/indefinite quantity contract for a maximum of 416,000 direct labor hours in support of the Granite Sentry Program, which will provide various software, hardware, and facility improvements to the NORAD Command Center, Air Defense Operations Center, the Battle Staff Support Center, and other agencies located at Cheyenne Mountain AFB, Colo.
- "Cheyenne Mountain Upgrade (CMU)". FY97 DOT&E Annual Report (webpage transcription of chapter) (Report). Retrieved 2012-09-09.
CMU also upgrades and provides new capability to survivable communication and warning elements at the National Military Command Center (NMCC), U.S. Strategic Command (USSTRATCOM), and other forward user locations. CMU additionally provides at Offutt, AFB an austere backup to Cheyenne Mountain ballistic missile warning.'
- Weeden, Brian C; Cefola, Paul J. Computer Systems and Algorithms for Space Situational Awareness: History and Future Development (PDF) (Report). SWFound.org. Retrieved 2012-09-02.