It's more space opera, but I've enjoyed the A. Bertram Chandler reprints
http://www.webscription.net/p-1319-t...actic-rim.aspx
http://www.webscription.net/p-1415-first-command.aspx
Those are the first two. The rest of the series is apparently on the site, but they've been bundling them (and reprinting them)