Killzone 2 Medic badge
The medic is the mainstay of any team, capable of reviving fallen comrades medics are vital to ensuring that an attack maintains momentum.
Strategy for Medics
As a medic its your job to save the lives of your comrades. The best strategy is to hold back, let the other more able classes rush in. As they fall revive them. Part of being a good medic also involves knowing when not to revive someone. If a squad member is out of ammo, or still caught in a cross fire, they'll probably rather respawn in a safer location.