Dmitri Kondratyev served as a crewmember on the International Space Station long duration mission Expedition 27 as Commander, having also served as a Flight Engineer on Expedition 26 during the same stay in space.
Head entity: Expedition 26
Tail entity: Dmitri Kondratyev
Relation (head \u2192 tail): astronaut mission
Inverse relation (tail \u2192 head): crew member