[citation needed] "The NMCC is responsible for generating Emergency Action Messages (EAMs) to missile launch control centers, nuclear submarines, recon aircraft, and battlefield commanders".

[1] The NMCC has three main missions, all serving the Chairman of the Joint Chiefs of Staff in his role as the principal military advisor to both the Secretary of Defense and the President (also known as the National Command Authority).

When directed by the NCA, the NMCC is responsible for generating Emergency Action Messages (EAMs) to missile launch control centers, nuclear submarines, recon aircraft, and battlefield commanders worldwide.

In the event that the president convenes a conference with advisors to discuss options for launching a nuclear strike, the DDO would be a key participant in the meeting.

The NMCC includes several war rooms, uses more than 300 operational personnel, and houses the United States side of the 1963 Moscow–Washington hotline which links the Pentagon and the Kremlin.

[citation needed] World War II Pentagon construction allowed a central military installation for the Navy and War Departments to communicate with theater commands, and CONUS air defense was based on warning data compiled by local Aircraft Warning Corps information centers for processing GOC observations and radar tracks to coordinate ground-controlled interception (cf.

[13]: 117  On the Pentagon's floor, the AFCP served "as a reception point for radio messages between [General] Vandenberg and his FEAF commanders during Air Staff after-duty hours.

[13]: 55  ADC built a new Ent AFB blockhouse in 1954 and "in August 1955 OSD approved the 'automatic' activation of the [Raven Rock] AJCC on the declaration of air defense warning or notice of surprise attack.

On July 1, 1958, the AFCP was connected to NORAD's Alert Network Number 1, as 1 of 29 transmit/receive stations[17] (a differing "worldwide telephone system" was complete "from national authorities to unified commanders" by December 1958.

on March 6, 1961[20] as part of the National Communications System (NCS) framework "encompassing all federal assets"[21] including approximately "79 major relay stations scattered around the globe" (cf.

)[24]: 312  The NMCC was initially considered an "interim" location until the Deep Underground Command Center (DUCC) could be completed below the Pentagon (never built).