Earthfleet Extended Universe
From ROI Wiki
The Earthfleet Extended Universe is a series of books that take the original Earthfleet Saga and expand upon it with new worlds, adventures, characters, and more, exploring farther and deeper into the universe than the first four books did. The extended universe isn't an actual series itself, but is rather an umbrella under which all other books, not associated with a series, and from the Earthfleet universe, are gathered, more for nice, tidy housekeeping than anything.