I have some anecdotal information. The ISS has a commander, and I noticed here that it had a Flight Engineer, and in this article (found here) I see that Skylab had a Science Pilot.

Do space stations (US, Russian, Chinese, and International) have standardized officer designations for crew? Are all standard positions always fully "staffed" when astronauts are present?

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    $\begingroup$ Sometimes the ISS has a Science Officer. nasa.gov/centers/johnson/news/releases/2002/h02-175.html My curmudgeonly take on this is that none of it means anything except for the commander. $\endgroup$ Mar 12 '19 at 1:18
  • $\begingroup$ @OrganicMarble it seems there must be some kind of designated commander-in-waiting in case the current commander gets a sudden case of appendicitis. Can't have someone just pull an Alexander Haig. $\endgroup$
    – uhoh
    Mar 12 '19 at 1:27
  • $\begingroup$ That's a deorbit three crewmembers case. $\endgroup$ Mar 12 '19 at 1:30
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    $\begingroup$ @OrganicMarble maybe it's a different question, and maybe it exists already and has an answer, but an activity that would probably benefit from having a commander $\endgroup$
    – uhoh
    Mar 12 '19 at 1:33
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    $\begingroup$ I hadn't thought about chain of command. It's here though: spaceref.com/news/viewpr.html?pid=3418 Sadly NASA doesn't publish the ISS flight rules and they are heavily referenced therein. $\endgroup$ Mar 12 '19 at 1:34

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