The Chief Medical Officer was in charge of the medical facilities at Carson City Camp. Before that job, he'd served as a combat medic.
Steven Johnson, Carol Smithson, and Oscar Shelton brought Sophie Donitz to him after she slipped into a coma. He informed them that the sallowroot she'd been smoking was the primary reason she hadn't fallen unconscious sooner, though he wasn't sure why. He also showed them unusual particles in her bloodstream, though he wasn't sure what they were. He then witnessed Whittaker arrest the three and take them to the brig.
Later, The three broke into the infirmary and forcibly stole a bunch of medical supplies. They then took Sophie and left; the CMO called General Jake Moby to inform him but it was too late to stop them. (Next of Kin)