I'm so proud of what they've done,

Be thankful for problems. If they were less difficult, someone with less ability might have your job.

That training really helped us on the second time around, ... It was one of those acts of fate.

Back in those days, going to the moon, geology was important, ... But how do we train pilots to be geologists? We concentrated on observing, not the analytical parts of the rocks.

The training in those days was rather ad hoc because the people running NASA were basically engineers,

The moon is essentially gray, no color; looks like plaster of Paris or sort of a grayish beach sand.