Starfleet Academy Courses. Subspace Communication: Subspace communications have a varying degree of band frequencies, from upper (or high-band) to lower. For example, a diplomatic frequency used by the Vulcans is on a lower subspace band. Consult: ENT: "Fallen Hero", "Dead Stop"; TNG: "Ensign Ro". Star Trek Starfleet Command | Starfleet Academy

Starfleet Academy Courses. Warp core: Warp core, or warp core reactor, is the common designation for the main energy reactor powering the propulsion system on warp-capable starships. | Starfleet Academy

Starfleet Academy. Courses. Starfleet Ranks. Range comparison tables. Officer ranks: Captain: The most senior regular officer rank below flag officer, it is most often held by starship and StarBase captains. Star Trek Starfleet Command | Starfleet Academy