DCS World - Amazing Realism in a game

Digital Combat Simulator World (DCS World) is a free-to-play digital battlefield game.
It is one of the most authentic simulation of military aircraft, ground and armor vehicles, and naval units possible. This free download includes a vast area of the Caucasus region as well as a free Mariana Islands map. It includes one of the most powerful Mission Editors ever designed, network play, and hundreds of AI weapons systems, ground units, armored vehicles, air defense systems, and ships. It also includes a free Russian Sukhoi Su-25T ground attack jet and the famous WWII North American TF-51D Mustang fighter.