Melvin Croft has more than forty years of experience as a geologist and is a longtime supporter of the Astronaut Scholarship Foundation. John Youskauskas is a professional pilot with more than thirty years of aviation experience in flight operations, aviation safety, and maintenance. Both authors contributed to Footprints in the Dust: The Epic Voyages of Apollo, 1969–1975 (Nebraska, 2010). Don Thomas is a former NASA mission specialist and the author of Orbit of Discovery: The All-Ohio Space Shuttle Mission.