Or better still, that guy who enlisted in the Navy to get off his backwater world, was so good as an Engineering Hand Third Class that he was sent to Officer Candidate School, served aboard your ship while you were both emsigns, and retired as a Commander with a Purple Heart, a Medal for Conspicuous Gallantry, and a knighthood for that day in the Fourth Frontier War when he figured out how to tow your ship out of danger to rescue you and your crew.
In short, you can find loyal people, and you can find competent people, but if you're smart you promote the people who are both.