You want teamwork and military tactics your playin the wrong game --->Try Rogue Spear instead, thats a game with required teamwork, communication, and tactics.
The elaborate tricks such as what VaShooter proposed sound good on paper, but to actually get a UT team (random players or friends) to communicate and orchastrate (sp?) something like that is hard to do.
Les face it, UT is 9 times out of 10 random unplanned carnage, charge with the enforcers blazin (and for my gaming needs right now, I'm kewl with that)
Peace out