When so many rounds are flying around, someone's bound to get hit sooner or later. Unfortunately, this 'someone' is occasionally a fellow squad member. When it happens, the squad medic is the man to turn to. The squad medic is critically important - they are the key to maintaining the combat effectiveness of the squad when heavy contact has been made.
The Squad Medic...
Are concerned first and foremost with the welfare of their squad members. While a medic carries a rifle, it is nowhere near as powerful as the skill he brings as a healer. Medics leave the fighting to the infantry, instead focusing on patching up the wounded and getting them back into the fight. Medics should only fire their weapon in self-defense, or in the defense of the wounded.
Stay a bit back off of the front line. This gives the medic a view of the bulk of the squad disposition and helps to prevent tunnel vision. By staying off of the front line, the medic is able to maneuver to different fireteams more easily in response to people being wounded, without drawing the same kind of fire as a frontline player.
Look out for their Squad Leader and provide rear and flank security when not acting in a medical capacity. The squad leader often is preoccupied with commanding his fireteams, leaving him less time to watch his back and flanks. The medic fills this gap whenever not actively helping out wounded players.
Are comfortable with using smoke to provide concealment for the wounded. Medics carry a number of smoke grenades that are intended to be used to conceal wounded players so that someone else can rush out and drag them to safety. Knowing where and when to throw these smoke grenades is a key skill for a medic to develop. He must be conscious of masking the wounded person from enemy observation, while at the same time not compromising the visibility of friendly elements.