[spoiler]The basics: 1)Set up a base of fire. Some one throwing everything at the enemy suppressing them keeping them in cover. 2)Set up a flanking team to assault the enemy go around the side or back. While they are being suppressed by the base of fire. 3)Throw a grenade to get them out of cover then mow them down with machine guns. 4)Sniper teams: one concentrating on sniping while the other with an assault rifle protects him from incoming enemies in close quarters. Have several camping spots planned out in a given map change spots when detected. 5)Setting up Defense. Each member has a designated area covering 360 protection intersecting areas of cover. Have a Quick reaction team to either flank/assault/reinforce the most hard hit positions. Edit1: Stay in cover during movement. One team is covering fire as the other team moves towards the objective and switch team roles until everyone makes it to the objective. Edit2: don't try to be a hero. If a team member is down in a open area needs reviving leave him. It's a trap to lure people out to snipe them. After all it's a game they'll be alright.[/spoiler]