Two of humanity's most recent lunar travelers — Reid Wiseman and Victor Glover, who guided the Artemis II spacecraft around the moon this past April — are stepping away from active spaceflight, not as a closing but as a turning. Their departure from the astronaut corps marks a quiet inflection point in the long arc of exploration: the moment when those who have gone farthest become the ones who help others find the way. NASA's newly formalized emeritus model suggests that wisdom earned beyond Earth's orbit need not be left behind when the training ends.