RIP Al. Gotta feel for the CM pilots of moon landing missions. Circled the moon with the stress of wondering if your crew in the LEM will make it back to lunar orbit. So close but never getting to step foot on the moon. None of the CM pilots of lunar landing missions ever made it back up to EVA on the moon. Lived life in relative obscurity compared to their moonwalking brethren. Everybody knows Neil Armstrong, most know of Buzz Aldrin, but Michael Collins was generally a trivia card answer.
David Scott and John Young, CM pilots of pre-lunar landing missions Apollo 9 & 10 did make it to the moon on 15 & 16. Jim Lovell, CM pilot of Apollo 8 would have made it to the moon on Apollo 13. Regardless, all of those guys were quite brave, but considering what the life expectancy of fighter pilots in Southeast Asia at the time, it probably didn't seem like that bad of a assignment.