Stand near a warzone objective on which you're on the defensive (carry the huttball, stand near the thingy in Alderaan, stand near the doors in Voidstar), unequip all your armour, re-equip it and then heal yourself. You'll get defender and healing points for this.
Steps:
1. Stand near warzone objective.
2. Unequip armour.
3. Reequip armour. (Health drops because of this.)
4. Heal yourself.
5. Free commendations!