It's not to physically train you. It's to simulate your expected mission in a sandboxed environment, without the immense risk of an IRL convoy with blanks, full gear. Mission logistics are multiple times more complex than Call of duty. Being physically located in an area you have never been, looking for something or somewhere, with only a GPS to guide you, and no little mission arrow to point you is an extremely different scenario than most video games paint it to be. IRL Simulations (Even CONUS at places like NTC) commonly have major injuries and even deaths, in preparation for OCONUS missions. I've used similar convoy simulators, and they are very fun, while eye opening at the same time as to the real situations you may occur.