...this one: Warzone 2100 (I think the first 3D ground RTS) :
http://www.mobygames.com/game/windows/warzone-2100
And if not, it could be WarGames, an older film-themed game from the same year (I think) as Warzone 2100 :
http://www.mobygames.com/game/windows/wargames (unfortunately no screenshots on Mobygames, but here:
http://www.ag.ru/games/wargames are some - but the page is in Russian).
Tell me if I'm right!