Used book – Vampire Earth, Book 1: Way of the Wolf, E.E. Knight

Louisiana 2065. Things have changed. In this 44th year of the Kurian Order, Earth is under the domination of aliens nicknamed "vampires" by the humans they have enslaved.

But the resistance has organized. David Valentine, who has never known the old world, is one of the elite soldiers, the Wolves, who fight to save humanity.

Fight. Kill. Survive.

Such is the way of the Wolf.