ITT 465L Strategic Air Command Control System

At the Offutt AFB nuclear bunker and at March AFB; SACCS had 3 AN/FSQ-31 systems each with a Data Processing Central (DPC), Data Display System (DDS), and Data Transmission Subsystem (DTS)[1] (Barksdale AFB didn't have a DPC.) The DCS consisted of an Encryption/Decryption Subsystem, High Speed Data Transmission Equipment (Modems), and an Electronic Data Transmission Control Center (EDTCC) with secure voice units and Technical Control Consoles (TCCs)--SACCS "voice transmission [was] by patching 4-wire telephone terminating equipment on the circuit at each end.[1] NORAD's 1963 Chidlaw Building Combined Operations Center, then Cheyenne Mountain Complex in 1966 (top left), received SAC data (e.g., to allow relay of messages through northern NORAD radar stations for recalling SAC bombers.)

In 1965, RCCs were at 13 "operational base command posts" (duplexed from different EDTCCs except for 4 RCCs with "short order sites"), and SRCCs were at 2 "missile site alternate command posts"—RCCs/SRCCs had a "Fault and Facility Control Panel.". One Offutt EDTCC communicated with 1 SRCC and 6 RCCs (with 2 circuits to the 1 local RCC), while the other Offutt EDTCC only had circuits to 4 RCCs (2 bomber, 2 ICBM). At the Numbered Air Force bases, circuits from one EDTCC were to 7 RCCs, and the other connected to 5 RCCs and 1 missile SRCC.[1]
Not to be confused with the subsequent SACCS which gradually replaced the 465L System.
SIMFAC

System Development Corporation (SDC) also built a Simulation Facility (SIMFAC) in Paramus, New Jersey to model the SAC Command Post using "Command/Control personnel stations, capabilities to produce simulated SACCS hardware printouts…wall displays [and] a soundproof observation deck [booth] in which SIMFAC personnel perform actions necessary to simulate all external occurrences starting from an Intelligence buildup to changes in threat responses"[2]--the 50 ft × 35 ft (15 m × 11 m) "isolation booth" was completed in 1962 by International Electric Corporation.[3]

The ITT 465L Strategic Air Command Control System (SACCS, SAC Control System, 465L Project,[1] 465L Program) was a Cold War "Big L"[4] network of computer and communication systems for command and control of Strategic Air Command "combat aircraft, refueling tankers, [and] ballistic missiles".[3] International Telephone and Telegraph was the prime contractor for Project 465,[5] 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"[1] (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[5] was AT&T ("end-to-end control" of the communications circuits),[1]

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