I think SWAT 4 has LAN. Hidden and Dangerous 2 is pretty great. The ARMA games are super-sim if you're into that.
Hidden and Dangerous 2, baby! Such an unknown wonder in the PC gaming audience. H&D 1 was the best cooperative experience of my life. H&D 2 is better in many ways and worse in a couple. It's missing the true cooperative experience. Either way, I highly recommend it. If you are going that way, check this out:
Although I may be one of the few people that actually enjoy Takedown...hopefully this gives the guys working on Ground Branch a loud and clear message that first impressions are everything for their game.
Quite the dilemma....to coexist in a world that ostracizes you into obscurity