If you're referring to Phasma, then as a general rule of thumb you should ignore her military rank. According to SW literature, although she's technically a captain, her true position in the First Order is much higher (more or less on the same level as Hux & Klyo Ren).
***EDITORS*** All the Star Trek Discovery Season 0 ("Short Treks") episodes here are MISNUMBERED. According to IMDb, s0e01 is Runaway, s0e02 is Calypso, s0e03 is the just-released Brightest Star; s0e04 won't be out until Jan. The links HERE for "01" are correct, but are the same as for "02" (or mostly so?--I didn't look at all of them), "03" are for the real 02, and "04" are for the real 03. Some other sites are making the same mistakes.
Watch 12 Monkeys Online
The show follows the journey of a time traveler, Cole, from the post-apocalyptic future. Using a dangerous and untested method of time travel, Cole arrives in the present day on a mission to locate and eradicate the source of a deadly plague that will eventually decimate 93.6% of the human race.