James McDivitt commanded the Gemini 4 flight during which Ed White performed the first U.S. spacewalk, and later the Apollo 9 flight which was the first crewed flight test of the Lunar Module and the complete set of Apollo flight hardware.
Head entity: Apollo 9
Tail entity: James McDivitt
Relation (head \u2192 tail): astronaut mission
Inverse relation (tail \u2192 head): crew member