May I suggest that y'all use the search function on this board regarding this question, there are some pretty detailed discussions of actual personnel administration practicies of the time, and how people attempt to simulate this in game, as theoretically one can pack a ship, after sufficient number of patrols with cheifs and officers.
Myself, I rotate all crewmembers at random, with a 1/3 chance of the person being transfered, this is after medals and promotions are awarded. Then I backfill with only ENSs and SRs, unless there is a need for a chief position, but this is only on a rare occassion, as promotions should have upgraded a PO1 to CPO after the last patrol, to fill the position.
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"The Federation needs men like you, doctor. Men of conscience. Men of principle.
Men who can sleep at night... You're also the reason Section Thirty-one exists --
someone has to protect men like you from a universe that doesn't share your
sense of right and wrong."
-Sloan, Section Thirty-One
 
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