National Military Command System

[1] The United States' Cold War command and control (C2) history included numerous developments such as the: After initial planning May–July 1962, DoD Directive S-5100.30 "conceived" the Worldwide Military Command and Control System (WWCCS) with five planned groups of C2 systems: the NMCS was the primary group and was to serve the President, the United States Secretary of Defense, and the Joint Chiefs of Staff.

The Alternate National Military Command Center (ANMCC) was established on 1 October 1962 at Raven Rock Mountain Complex and included a joint War Room Annex, "Headquarters USAF Advanced" center, an Army communications complex to connect the ANMCC to several communications networks such as NORAD's Alert Network Number 1.

It was started in early 1962 when the JCS area with the Joint War Room was expanded from ~7,000 sq ft (650 m2) to ~21,000 sq ft (2,000 m2) by 1965[5] (the Pentagon's "Navy Flag Plot" coordinated the Cuban Missile Crisis blockade.

)[5]: 312  The NMCC was initially considered an "interim" location until the Deep Underground Command Center (DUCC) could be completed below the Pentagon (never built).

The NMCC had "direct communications with MACV headquarters in Saigon" during the Vietnam War.