The
ITT 465L Strategic Air Command Control System (SACCS) with its
IBM AN/FSQ-31 SAC Data Processing Systems attained operational capability on January 1, 1968. On October 6, 1975, it began to be replaced, when the SACCS original
IBM 4020 Military Computers were replaced by
Honeywell 6080 computers (remaining FSQ-31 components were entirely decommissioned in November.) The
Strategic Air Command Digital Information Network was deployed to replace SACCS' "Data Transmission Subsystem and part of the Data Display Subsystem", e.g., on November 5, 1986, "
Martin Marietta Corporation technicians began installing SAC Digital Network (SACDIN) equipment in
91st Strategic Missile Wing missile launch control centers (i.e., either a
HUTE rack or
MBCP rack). On February 20, 1987, "SAC declared initial operational capability for the
SAC Digital Network when [it] operated successfully between the Headquarters SAC Command Center and the
55th Strategic Reconnaissance Wing Command Post, both located at Offutt AFB, Nebraska, and the
351st Strategic Missile Wing Command Post at
Whiteman AFB, Missouri." SACDIN eventually "linked 135 locations and permitted two-way message communications with ICBM launch control centers for the first time," and the
Ground Wave Emergency Network communication system had a Final Environmental Impact Statement issued in September 1987. ==SAC Automated Command and Control System==