Chatter,
Funny you should mention Walter Schirra, just this week finished a book by Andrew Smith entitled "Moondust - in search of the men who fell to earth"
Fascinating account of what they were doing in the early 2000s.
If you are interested in their lives after they left the Moon programme, its worth getting hold of a copy. One the reviews said "When Andrew Walker set out to write Moondust, three of the twelve moonwalkers had already died. He has given himself the task of talking to the rest before they too went into eternal silence"
Paul