The IBM 473L Command and Control System (473L System, 473L colloq.) was a USAF[1] Cold War "Big L" Support System with computer equipment at The Pentagon and, in Pennsylvania, the Alternate National Military Command Center nuclear bunker. Each 473L site included a Data Processing Subsystem (DPSS), Integrated Console Subsystem (ICSS),[2] Large Panel Display Subsystem, and Data Communications Subsystem[3] (Automatic Digital Network interface:[4] "AUTODIN Data Terminal Bay").[5] The "System 473L" was an "on-line, real-time information processing system designed to facilitate effective management of USAF resources, particularly during emergency situations"[6] e.g., for: "situation monitoring, resource monitoring, plan evaluation, plan generation and modification, and operations monitoring".[7] In 1967, the 473L System was used during the "HIGH HEELS 67" exercise "to test the whole spectrum of command in a strategic crisis".[8]: 430
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