The first is Carl W. Greer, who is the G.I. Joe Team's original medic and debuted in 1983. This Doc was born in Concord, Massachusetts.
His real name was Carl W. Greer and he was ranked as an O-3 Captain. He was born in Concord, Massachusetts. His primary military specialty was medical doctor and his secondary military specialty was chaplain's assistant.
Doc was the first member of the G.I. Joe medical team, and possibly the only one with a terminal degree; his M.D. Doc graduated from Harvard Medical School, and completed his residency at Johns Hopkins to become a full medical doctor. He also completed Airborne School, Mountaineering School and the Desert Training Unit. He is an avowed pacifist for practical reasons, in accordance with the Geneva Convention guidelines for battlefield medics. A spiritual man, he devoted himself to alleviating suffering in the world, and admired the G.I. Joe Team's efforts to do the same, by challenging those who would bring about violence and chaos.
He first appeared in the "A Real American Hero" mini-series, voiced by the late Buster Jones.