best described as "Dirty Dozen" set in the 40K universe 4 books Amazon doesn't have the things correctly archived here the order and links book1 book2 book3 book4
The Best-Selling Series That Rocketed David Drake to Military Science Fiction Stardom. The First of Three Volumes Collecting the Complete Series. With a veteran’s eye for the harsh and gritty details of war, David Drake depicts a futuristic analog of Read more

Sent on an exploratory mission to the dead worlds of the Old Empire, Commander Jared Mertz sets off into the unknown.
Only the Old Empire isn’t quite dead after all. Evil lurks in the dark.
With everything he holds dear at stake, Jared must fight like never before. Victory means life. Defeat means death. Or worse.
If you love military science fiction and grand adventure on a galaxy-spanning scale, grab “Empire of Bones” and the rest of The Empire of Bones Saga today!