Electromagnetic compatibility (EMC) represents a fundamental challenge in modern military operations where communication systems and radar installations coexist in a dense electromagnetic environment. This paper investigates the complex interactions between radiofrequency (RF) systems in the context of integrated combat management (C4ISR), analyzing the mechanisms of electromagnetic interference (EMI) and strategies for their mitigation. The methodological approach combines a systematic literature review with analytical modeling of interference scenarios, including quantitative evaluation of coexistence performance between radar and communication systems in the S-band and millimeter-wave frequency range. Results demonstrate that dynamic spectrum allocation, cognitive radar techniques, and spatial separation can significantly reduce mutual interference, with advanced interference cancellation algorithms achieving signal-to-noise ratio improvements of 15-25 dB. The research also identifies critical electromagnetic separation thresholds and recommends an integrated spectrum management approach that balances the operational requirements of radar surveillance and tactical communications. Conclusions indicate the necessity of implementing adaptive EMC protocols in the integrated combat management architecture, particularly in the context of network-centric warfare where simultaneous operation of multiple RF platforms represents an operational necessity.