Presents a modern view of the problems of assessing the effectiveness of military communications systems and means. The methodology for calculating indicators of reconnaissance security of radio-electronic means and noise immunity of means and lines of military communication is presented in detail. Ways to improve the efficiency of protecting a military communications system from deliberate interference and high-precision weapons are analyzed. The book is an addition to well-known publications in the subject area and is intended for students, adjuncts, teachers and specialists in the field of analysis and synthesis of information and technical systems.