Battlefield 2
From OCE Space Simulation
Battlefield 2 has been Spacesim's game of choice at LAN parties since 2005-06. Battlefield 2 is a team based FPS (First Person Shooter) Which requires players to work together to achieve objectives. Battlefield 2 supports up to 32 person multiplayer, and because of this, it is perfect for a large organization whose player count can go over the 8 - 12 person limit of some multiplayer games such as Starcraft, another game of choice at spacesim LAN Parties.
For more information, please see the Wikipedia page on Battlefield 2