In order to fully grasp the training dynamics of the U.S. Army, the architecture and functions of the synthetic training environment (STE) system are systematically described, the application of new information technologies such as augmented reality and AI in the system is analyzed, and the development status and future trends of the system are discussed based on the national defense budget input. The results show that the research can provide reference for the construction of our army’s soldier operation and commander training system, and help our army better deal with threats and challenges.