You’ve surely never heard of C.C. Williams, but you would have if he’d been the fourth man on the moon, as he was supposed to have been, piloting the lunar module during the 1969 mission of Apollo 12. As Williams was flying a T-38 over Tallahassee near the Georgia border one October day, however, one of his flaps jammed, causing him to slew left in a terrible roll. He radioed a mayday and ejected as he’d been trained. But he was going far too fast and bailed out too low for the parachute to open properly. He fell to his death on a Florida plantation. Just over two years later, Pete Conrad, Dick Gordon and Alan Bean successfully flew the Apollo 12 mission. They saw to it that their mission patch, which was designed to feature a star for each of the three astronauts aboard, would also include a fourth.