The 3 current Multi-player tank simulations. Steel Beast Pro PE (SB) Military Based simulation: http://www.steelbeasts.com/ SB has a great sensation of driving a tank, the tank is solid and just feels very nice. Optics, we can assume are correct due to this being a mil/sim. Sounds are ok, though the mods really improve the stock sounds. All playable tanks have multi-crewable positions. The green maps are excellent with a large view distance of 3.5k. Realistic ballistics and damage model is also based on military data supplied by the Army that purchases the Professional version. There is also damage to the tank/vehicles systems and the ability to repair the damage or call for a tow, if a human player is on hand to drive the recovery vehicle.