Tail of a Soldier Book 4 The Prequal by Rocky Rochfort

Before Dah-kah's injuries caused his untimely discharge from the United Council Military, he was a dedicated soldier. With his promotion to Sergeant comes an assignment to a new unit. On his way to report in, he will have to deal with pirates, kidnappers, and hostile aliens. On the other hand, he also meets people as courageous as he is, that will become life-long friends.