Aside from being one of the game’s most fabled playgrounds, Augusta National Golf Club is a well-groomed workplace, where people punch the clock and earn their keep. Take Carl Jackson as a case in point. The second of nine children, born and raised in Augusta, Jackson started caddying at Augusta National in 1960, when he was 13, and worked his first Masters the following spring. He kept up that tradition for more than half a century, going on to set the record for most appearances by a caddie — 54 — in the event.