Captain (The United Federation Marine Corps Book 4) by Jonathan P. Brazee

As a captain, Ryck Lysander is given one of the most sought-after billets in the Marines: an infantry company commander. His new battalion commanding officer, however, is not impressed with Ryck’s past accomplishments, and Ryck finds himself struggling to fulfill the CO’s expectations. Used to his and “hero and ” status within the Corps, his new position of having to prove himself grates on him. Now, as his company marches to the sound of gunfire, Ryck must find it within himself to be an effective combat commander.