[Edit: I've added the info in teh replies.]
- Medic: buff health
- Medic: heal
- Medic: "revive" fallen
- Medic: buff skill uses
- Medic: buff speed
- Medic: Adrenaline
- Soldier: give ammo.
- Engineer: buff damage
- Engineer: buff armor
- Operative: Give map info
Is that all? (Or even correct?)
[Edit: What I mean by direct is support that's applied directly to a teammate, not strategic advantages like mining of finding mines, creating paths, providing scouting intel, etc.]