Operation Flashpoint: Red Hammer
The Red Hammer was a campaign produced by Codemasters and not by BI in 2001, and is seldom talked about in the community due to the fact that it was awash with bugs. It's a shame really, as the concept was pretty good and had a lot of potential.
The player takes on the role of Soviet soldier Dmitri Lukin in the same timeframe as the Cold War Crisis campaign. A former Spetsnaz operative, Lukin somehow disgraced himself and was demoted to a mere grunt. Through the Red Hammer campaign Lukin progresses back up the ranks and finally regains his honour and standing, only to learn that the cause for which he is fighting is not as legitimate as he had thought...