operation flashpoint, though unfortunately not that many tank missions (not that there isnt sometimes oppertunity to nick one as a footsoldier 😉) in the main game, perhaps theres more in the addons that come with the game now (if you buy GOTY edition anyway). Last i was playing it though there was a very big and active custom map scene - probably because the way it works you can make very impressive, quality levels using the games' huge islands, just by placing the bad guys and scripting.