The proliferation of new technologies with 5G and future 6G networks may also find application in the field of military communications. However, new challenges must be considered due to the level of security required in tactical environments. In this article, we have focused on analyzing these challenges in practical use cases for military communications. First, we select and present a set of emerging technologies associated with 5G and 6G, such as Artificial Intelligence, network virtualization and softwarisation, Neuromorphic Processors, Internet of Things (IoT), Network Slicing, Tactile Internet or Blockchain, focusing on their applicability in tactical environments. On the other hand, we present an overview of the primary tactical radios that can face the challenges imposed by these technologies. Then, we show the main benefits and possible scenarios to improve efficiency in the military environment, such as situational awareness to increase the safety of soldiers on the battlefield, thanks to emerging technologies selected as potential candidates.