A unique overview of the United States current nuclear command control and communications system and its modernization for the digital ageConcerns about the security of nuclear command control and communications NC3 systems are not new but they are becoming more urgent. While modernization is crucial to the future success of NC3 systems the transition from analog to digital technologies has the potential to introduce vulnerabilities and unintended consequences. Nuclear infrastructure and command could be penetrated corrupted destroyed or spoofed leading to a loss of positive control the ability to fire weapons or negative control the ability to prevent unauthorized or accidental use.Nuclear Command Control and Communications explores the current NC3 system and its vital role in ensuring effective deterrence contemporary challenges posed by cyber threats new weapons technologies and the consensus across the nuclear enterprise of the need to modernize the United States Cold Warera system of systems.