(1) National security system.— In this section, the term national security system means a telecommunications or information system operated by the Federal Government, the function, operation, or use of which
(A) involves intelligence activities;
(B) involves cryptologic activities related to national security;
(C) involves command and control of military forces;
(D) involves equipment that is an integral part of a weapon or weapons system; or
(E) subject to paragraph (2), is critical to the direct fulfillment of military or intelligence missions.