One of the bravest, most extraordinary acts of valor American troops are known to do in combat is throwing themselves on a grenade to save their brothers and sisters in arms. Few survive such a selfless act of heroism. Even fewer get the opportunity to risk sacrificing their lives for a fellow service member twice. Oscar Palmer Austin was a Marine who did just that. It happened on the same fiery night in Vietnam, and he did it to save the same person. For his selfless bravery in saving...