VALIANT DUST by Richard Baker

A new review over at Tor.com:

Sikander Singh North is a prince of a planet that is, essentially, a colonial protectorate of the powerful space nation of Aquila. He’s been an officer in the Aquilan Commonwealth navy for ten years, and has now received the position of gunnery department head aboard the light cruiser Hector. He’s junior for the post, and several of his colleagues disapprove of him on grounds of where he comes from. Fortunately, he has a mostly sympathetic captain, but he must prove himself to some of his direct superiors.