The Dragon Corps Books 1-4

As commander of one of the most decorated Dragon teams in history, Talon Rift has taken down the worst humanity has to offer-slave traders, terrorists, arms traffickers, and more. But one of his quarries has always eluded him: the Warlord of Ymir, the man who marched an army of mercenaries onto a planet decades ago and has held it ever since. Taking the Warlord down with a team of 16 is a suicidal idea...
But Dragons aren't known for their good sense of self-preservation. They're known for doing whatever it takes.