To Behold the Moon: The Lunar Orbiter Project. Chapter 10, Spaceflight Revolution, NASA SP-4308 But, Cliff, you said we weren’t going to improvise like this…. But, listen to what I say now! We’ve worked out the numbers. It’s worth the risk. – Conversation between Boeing engineer project manager Robert J. Helberg and Clifford H. Nelson, … Continue reading To Behold the Moon: The Lunar Orbiter Project