ITT 465L Strategic Air Command Control System
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 465L communication diagram (Fig. 1)
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prototype EDTCC at ITT test site
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 SAC Command Post (at minute 5:25)
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The ITT 465L Strategic Air Command Control System (SACCS, SAC Control System, 465L Project, 465L Program) was a Cold War "Big L" network of computer and communication systems for command and control of Strategic Air Command "combat aircraft, refueling tankers, [and] ballistic missiles".International Telephone and Telegraph was the prime contractor for Project 465, and SACCS had "Cross Tell Links" between command posts at Offutt AFB, March AFB, & Barksdale AFB (SACCS also communicated with the Cheyenne Mountain Complex and Air Force command posts. The 465L System included IBM AN/FSQ-31 SAC Data Processing Systems, Remote (RCC) and Simplex Remote Communication Systems (SRCC), SAC Network Control Office, "4-wire, Schedule 4, Type 4B alternate voice-data operation", and one-way communication with "ICBM launch control centers" (the SAC Digital Network upgraded to two-way communications.) In addition to IBM for the "Super SAGE type computers", another of the 6 direct subcontractors was AT&T ("end-to-end control" of the communications circuits),
Strategic Air Command began using the telephonic ACAN in 1946 until switching to the 1949 USAF AIRCOMNET "command teletype network" (the independent SOCS with telephones and teletype was "fully installed by 1 May 1950".) SACE deployed a worldwide communications network in 1958 with a day-to-day telephone system, a teletype system, an SSB HF system, and the Primary Alert System--"a direct line telephone system between the SAC underground command post and all its subordinate command and control centers (numbered air force and wing command posts)."
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