Well you could try the Call of Duty 1 MP; though its not the best (2 might work?) its good enough; plus its selling really, really cheap if you manage to get a copy, plus the expansion UO has vechiles and ranks. (#2 is $20 so 1 is about 10)
Try America's Army. I don't know if you can play it LAN, but if you get past the Training its a absolutely magnifcent game.
And my final recommendation is one of the Battlefield games. There is battlefield 1942 which is a 2003 game so hould work fine, plus it has a lot of mods which change the gameplay dramticlly (From WWII to Vietnam, Gulf War, Pirates or ACW, etc) THeres also battlefield Vietnam which is similar, not as good (And not as many mods) but has extras like napalm.
Bookmarks