The application of extended reality (XR) technology such as augmented reality (AR), virtual reality (VR), and mixed reality (MR) to create a near-realistic situation, so that the user can be fully engaged, resulting in connection and resonance, is called “immersive experience”. XR has a long history of use in the military field. The first use of AR technology in the field of military operations was more than half a century ago, and in the early 1990s, the United States took the lead in applying VR technology to military training. In recent years, with the development of software and hardware-related technologies such as optical photography, positioning recognition, and somatosensory measurement, the term “mixed reality (MR)” from the hybrid application of AR and VR technology; the term “extended reality (XR)” has become a representative of the spectrum of this virtual reality hybrid technology. In February 2022, XR technology was listed by the U.S. Department of Defense as one of the 14 key technology areas. With the continuous maturing of XR technology and the development of 5G technology, the application of XR immersive technology in the military field has also been expanding. Unlike most military technologies that focus on increasing the lethality of soldiers, XR focuses on improving combat efficiency, making its application versatile and cost-effective. Tactical superiority, rather than raw firepower, became the new measure of the strength of the army. In addition, with the introduction of 5G networks, with their speed, capacity, and data response, as well as the processing power of cloud technology, XR technology will become easy to use; and because XR has the nature of information system applications, information security must also be ensured. This chapter explores the advantages and progress of XR immersive technology in the military's application of combat and logistics.