Steel World by Edward Larson

In a universe where interstellar travel and warfare are commonplace, a young recruit finds himself thrust into the brutal world of mercenary soldiers. As he navigates the harsh realities of combat on a distant planet, he must quickly adapt to the unforgiving environment and the complex dynamics of his fellow soldiers. Amidst the chaos of battle, he discovers the true cost of survival and the bonds forged in the crucible of war, ultimately questioning his own values and the nature of loyalty in a world driven by conflict and ambition.