i go like 6-2/2-1 as an assault and i always get top three. it's probably because i revive stuffloads of people while they rush. i've also found out the best way to destroy a tank is to run around it while sprinting and then have someone else shoot it down. i've done this so many times it comes naturally, all i do is toss a grenade under the tank and run in circles while periodically ducking behind cover, the tank is distracted and it gets shot to stuff. i've also gotten pretty good at getting in tanks and unloading shots, then getting out before the tank explodes. also, i was hit by a tank yesterday and lived with 0% health...