1) Authority source 2) Headquarters 3) Operational headquarters 
a collection of nerve cells in the central nervous system that are associated together in the performance of some particular function, such as a primary area or an association area.
nerve centre noun a center that provides information and control; `the nerve center of the diamond industry is in Amsterdam`
a group of nerve cells closely connected with one another and acting together in the performance of some function. · a source of information, authority, action, etc.: The communications room is the nerve center of a battleship.