Basically, wat my team does is try and get all the weapons while staying together. One guy should start off by getting the battle rifle and one other should get the covie sniper. The sniper should keep an eye on the rocket launcher while the battle rifle guy goes to get it, the sniper should be able to pick off the defender that was also after it. Then, the rocket guy rides shotgun in the puma and get a gunner in there also. By this time, the driver should also have a sword. During this time, the bomber should be sneaking around the back and crouch walking once he gets close, have the puma drive up through the cave and right ontop of the bomb spot. The rocket launcher guy should be able to kill everyone in the base because of the added protection from being in the puma and the gunner can pick off any extras that got their shields destroyed by the rockets and the driver can hop out and hopefully take a few out with the sword. With the gunner, a rocket laucnher, and the sword guy, you should be able to hold off the newly spawned guys. The rocket launcher guy just has to make sure that he does some good damage to the other team. It is also a good idea to leave any retard defender around that has rushed your spawn point so they dont end up respawning back at their own base making it a 3v3 battle.
One more thing I noticed is when everyone is fighting to get the bomber to the position he needs to be in, the bomber holds on to the bomb. He should just drop it at the nearest sign of danger to help fight. In order to win, it would be like a 3v4 and the 3 people have to be getting double kills any shit just to keep up with the speed at which the enemy respawns.
One time, the bomb guy got in the passenger, we got a gunner and a driver. I drove it right through that cave and went along that lil passageway to the bomb planting place and drove it right on top. Bomber hopped out, gunner got a killtacular and game was over. It was cool as hell <