https://en.wikipedia.org/wiki/National_Military_Command_Center
NMCC
The National Military Command Center (NMCC)[1] is a Pentagon command and communications center for the National Command Authority (i.e., the President of the United States and the United States Secretary of Defense).
Maintained by the Department of the Air Force as the "DoD Executive Agent" for NMCC logistical, budgetary, facility and systems support;[2]
the NMCC operators are in the Joint Staff's J-3 (Operations) Directorate.[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 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).
The primary task of the NMCC is to monitor worldwide events which may be of defense significance.
The NMCC also has a crisis response component (e.g., response to the bombing of the USS Cole, the September 11 attacks,[3][4] the attack on the USS Liberty,[5] and Payne Stewart's plane crash.[6]).
And a strategic watch component (e.g., monitoring ballistic missile launches and other nuclear activity).
The NMCC is responsible for generating Emergency Action Messages (EAMs) to missile launch control centers, nuclear submarines, recon aircraft, and battlefield commanders worldwide. It maintains the American end of the famous U.S.–Russia hotline (the so-called "red telephone").