Windows Steel Panthers: Main Battle Tank
A very realistic turn based strategy game. Pretty much a board game turned computer game, and utilizing the computer aspect to make it less of a number crunchers dream and improving game play. I always like turn based games with hex grids to move and calculate range. Real tactics work very well in this game. Your key is to keep your units together like they would in reality.
Off board artillery is great! Keep your eyes on targets though... Like in reality, hitting template targets rarely works. CAS needs some work! When your A-10's don't strife targets after using Maverick missiles... Lets just say, that ain't too real. Along with the complete lack of a US Air Force TACP capability.