Armored Brigade

A T-80 tank bogged-down beside a river gets cluster-bombed by a passing A-10. The plane then strays too close to a Shilka and is shot from the sky, crashing next to a forest occupied by two Russian ATGM teams. These teams have just killed the lead vehicle in a column of Bradleys and, anticipating a retaliatory artillery strike, are pulling back. They're retreating on foot because their taxis, two BMP-2 IFVs, were destroyed five minutes earlier by prowling M1A1s.
 
Sound interesting? If the answer's yes then you may enjoy Armored Brigade. A free real-time wargame with Combat Mission and Close Combat echoes, it's causing quite a stir in groggy circles at the moment. Shock Force might have the graphics and the granularity, but AB has the flexible skirmish generator and the wary TacAI. Hopefully, future versions will include better map shading (reading terrain can be tricky), a save function, and a few fripperies like unit photos. Not everyone knows just how cool MIM-72/M48s look.