The objective of this lecture series is twofold. First, it will give a brief introduction to NGN and the technologies re-lated to it. NGN will be one of the biggest communication network evolutions ever seen. Secondly, it will discuss the challenges NGN poses to military communication. Technically NGN could mean real convergence of fixed/mobile/ military networks and seamless communication between these networks – without numerous gateways as today. Con-vergence of the technologies means to use COTS in military networks and so the economical saving would be significant.