Special Ops Squad Series by Rick Shelley

Before Spec Ops Squad training is completed, Sergeant Bart "Dragon" Drak gets the news that the enemy Ilion Federation is making a push towards the core worlds, which would spell doom for Earth and its allies. Now, the Spec Ops Squad must hold off the Federation tide to the last man -- or alien.

From Rick Shelley, acclaimed author of the breakout bestselling DMC series, comes the second book in the Spec Ops Squad saga. Sergeant Bart Drak's Combined Regiment embarks on its second mission against the Ilion Federation-provided the varied alien races of his platoon don't kill each other first.

Still reeling from their last mission, Sergeant Bart "Dragon" Drak and his regiment must establish a military outpost on the planet Unity before a suspected Federation invasion.