Currently reading the second in David Drake's long running RCN series,
Lt. Leary, Commanding, having pretty much devoured the first one,
With the Lightnings, over the weekend. An interesting series, avowedly based on the Aubrey/Maturin idea of two very different people as very close friends while one is in the command path of a navy (The Royal Cinnabar Navy) while the other is a warrant officer and not in a command path (or inclination towards one, either.) So far, I'm quite enjoying it. Drake is no O'Brian, but they're an enjoyable cross between Space Opera and MilSF. The Audible narration is uninspired, but acceptable, and the first book in the series is
completely free for the eBook version. Several of them appear in one or another
Baen CD, so are free as well, though there's a moral obligation, IMNSHO, to actually purchase if you read it with those.