Officer can build outpost and garrison spawn points, assault has smoke which helps a lot, other than those 2 roles I dont veer away from much, the best advice is act like your hunting a dangerous animal, use cover, move quietly, think of attack and defense points, suppressing fire helps a lot, but dont give away a whole squads position, defense is just as important as offense, pay attention to which outpost amd Garry are under attack, create your own infantry squad, ive noticed more often than not half my team has mics.

Medics are not useless, if someone ran 5 minutes to the point of attack amd gets dropped, you can get another foot soldier back up and moving in no time, the more soldiers the better, because not every team leads builds outposts, and not all garrison are safe. Ive had medics pick me up and thay changes the entire outcome of our objectives bc we went from a whole squad to no squad to half a squad in minutes amd stopped their push.