National Military Command Center

Overview
The National Military Command Center (NMCC) is located in the Joint Staff area of the Pentagon. The NMCC is responsible for generating Emergency Action Messages (EAMs) to launch control centers, nuclear submarines, recon aircraft and battlefield commanders worldwide.

The NMCC staff provides continuous operation monitoring, reporting, training, maintenance management, and coordination for all communications-electronics activities and systems supporting the NMCC to ensure minimum essential National Military Command System (NMCS) connectivity for the Single Integrated Operational Plan execution, worldwide situation monitoring, and crisis management. It also provides Joint Staff with ADP operations, support and information relating to operational capabilities of the United States in the area of nuclear command and control, primarily missile warning systems of the Integrated Tactical Warning and Attack Assessment (ITW/AA) network.

Source

 * "National Military Command Center (NMCC)" (full-text).