When Apollo 16 astronauts landed on the moon fifty years ago today, one of their first stops was a crater they named Flag. That’s a secret tribute to Flagstaff, Arizona, where the astronauts did their geology training. KNAU’s Melissa Sevigny spoke with local space historian Rich Kozak about Flagstaff’s unique connection to Apollo 16. Kozak has amassed a collection of archival tape about the revolutionary moon mission.