Here we have Doc, the pacifist medic, in Halo Reach.
"A doctor cures people, a medic just make them more comfortable while they die."
"Tucker's kid drank half a gallon in one go. I'n't that cool? I think he's gonna be a linebacker. Or a vampire. Or a vampire linebacker! That'd be crazy."
"Tell you what: put me back in the wall, I like the wall. It was cozy and it protected me. I miss my wall."