Holding the Line by Rick Shelley

As members of the Alliance of Light, humans have committed to the battle against the Ilion Federation, and they're doing their part. But the Alliance's army is fragmented, and to unify their forces, the army's leaders must do the unthinkable: they form the First Combined Regiment, made up of soldiers from every alien race in the Alliance.
The Spec Ops Squad is supposed to be the best of the best, an elite group within the First Combined Regiment to take care of the dirtiest jobs. Sergeant Bart "Dragon" Drak isn't too surprised to learn that these warriors don't have a whole lot in common, and it's obvious that it will take a lot of work to turn a bunch of commandos into a team. He didn't sign up for this, but he's got to see it through.
In the midst of training, the Spec Ops Squad is called off to planet Dintsen to fight off an invasion from the Ilion Federation. With such an elite fighting force, beating them back should be a piece of cake... except Ilion's got the same...

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