Erik Lynd 
They Eat Their Own [EPUB ebook] 

Jake wants nothing more than to forget the war. A war that left him full of hatred and resentment.

He withdraws from the world and its new tolerant ways with his dog. But when the old enemy crash lands in his backyard, his prejudices are challenged, and he must choose between compassion and vengeance.

Unfortunately, sometimes the right choice is not always the obvious one.