UniversalStarfleet

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The Starfleet line rank immediately inferior to lieutenant commander.
Officers at this rank typically had some command experience, and were occasionally appointed department heads on starships.
Typically they were shift commanders in a department under a lieutenant commander; for example, a lieutenant commander would be chief of engineering and commander of A shift, and there would be a B and a C shift, each under a lieutenant.
Additionally, some advanced Starfleet training programs, such as Advanced Tactical Training, commissioned their graduates at this rank. (TNG: "Preemptive Strike")