I don't doubt that he went to Vietnam as a medic though as others were saying , any resemblance to Hawkeye from M*A*S*H is somewhat exaggerated. It looks like he has been dining out on this experience ( both literally & metaphorically ) for the rest of his life.
He doesn't strike me as a particularly impressive individual , judging by his talks. I suspect that if he wasn't "anointed" he would just be a fairly mediocre congregation elder , maybe not even service committee status & probably rarely used for assembly parts.
It shows the paucity of GB candidates that someone can "come into the truth" in his early 20's & eventually reach GB status. We all know how long it takes for someone who isn't brought up as a JW to become fully assimmilated & comfortable with all the jargon & procedures.
It may well be that from the ( admitttedly increasing ) pool of people who claim to be anointed , one you discount the sisters , the obvious nut jobs , excessively elderly ones etc that there really are only a few "anointed" JWs who could ever be considered as GB members. Scary thought........