"The Nuclear Command and Control System (NCCS) infrastructure supports the President and his combatant commanders when they direct nuclear forces. This report discusses the current role of the NCCS in light of the 2001 Nuclear Posture Review (NPR) and the 2006 Quadrennial Defense Review (QDR), examines current issues surrounding the NCCS, reviews modernization initiatives, summarizes NCCS functions and characteristics, and reviews NCCS platforms. Key NCCS platforms include fixed locations such as the National Military Command Center (NMCC), the U.S. Strategic Command (USSTRATCOM) Global Operations Center (GOC), and Site-R, and mobile platforms such as the E-4B National Airborne Operations Center (NAOC), the E-6B Airborne Command Post (ABNCP), and the Mobile Consolidated Command Center (MCCC). The NCCS must support situation monitoring, tactical warning and attack assessment of missile launches, senior leader decision making, dissemination of Presidential force-direction orders, and management of geographically dispersed forces."
CRS Report for Congress, RL33408