"Renegades" by Craig Alanson is the seventh book in his "Expeditionary Force" series. I must admit I quite liked it. I've enjoyed all the books in the series than came before it. it's (sort of) in the same vein as Heinlein's "Starship Troopers" and Haldane's "The Forever War". It has believable characters, and the sci-fi element is consistent. The author has decided exactly how his "Impossible science" works, and he stays within his self-imposed boundaries. that (for me) is the difference between good sci-fi and "Harry Potter Magic"
Of all the books I've reviewed so far, this is one of the better ones.