Expanding Reality discusses the rise of virtual reality (VR) and its expanding use in the military. VR has been used for simulation and training purposes by the military since the 1960s. The document outlines the growing VR market, projecting it to be a $35 billion industry by 2026. It also details how the US military's 2019 budget includes $64 billion to be spent on VR capabilities for training and simulation across various military assets. The increased use of VR by the military is allowing for more realistic training exercises using virtual environments.