It may seem like a scene from a movie, but it is a virtual exhibition scenario using extended reality. Extended reality (XR) refers to the creation of virtual spaces that resemble the real world, including virtual reality (VR), augmented reality (AR), and mixed reality (MR). In the era of the Fourth Industrial Revolution, military training is also evolving with advanced technologies, where soldiers wear VR equipment and fight in a metaverse (3D virtual world) as if in real combat.