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| | Apollo 10 Mission Overview |
 | | He was back-up pilot for Gemini 3, pilot for Gemini 6, command pilot for Gemini 9 upon the death of a primary crew member, back-up commander for Apollo 7, commander of Apollo 10, and commander of the Apollo-Soyuz Test Project. |
 | | Apollo 10 was a dress rehearsal for the landing missions that would follow and as such, it was a fully configured spacecraft. |
 | | He was the pilot of Gemini 9, back-up pilot for Gemini 12, back-up lunar module pilot for Apollo 7, lunar module pilot on Apollo 10, and back-up commander for Apollo 14. |
| www.lpi.usra.edu /expmoon/Apollo10/A10_Overview.html |
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