Haven't played in a while, but I've been rocking "Combat Medic" on my Warrior casually since I unlocked it. It was one of the first titles I unlocked, and definitely the first that I actively tried to get. I remember a forest in one of the early human zones with a bunch of downed soldiers and a heart quest that involved reviving them. I dropped a battle standard on a group of them every time I passed by to get progress towards the achievement.