ORBITAL - TOME 1 SCARS

In the 23rd century, the humans and the Sandjarrs are allowed to join an intergalactic multi-species organisation set up 8,000 years before. The humans are seen as a belligerent, underdeveloped race by the other members of the organisation and had been kept out of it until now. The Sandjarrs had stayed out of interplanetary politics until a war between themselves and the humans broke out. Now Caleb, a human, and Mezoke, a Sandjarr, are paired up and trained as special agents to keep the intergalactic peace.
This is a controversial and historic alliance, and a lot of people are watching them. Their first mission is to keep war from breaking out between a Human colony and the alien Jâvlods over possession of the planet Senestam.